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初学者:X25045看门狗编程第一次作项目，系统复位电路采用X25045看门狗芯片，我找资料查了一下，发现只作系统复
位使用，好像不用编程，又觉得不对，请高手指点迷津，如果那位大侠恰好也在使用X25045
有现成的程序清给我发一份（最好有注释），不胜感激，LLAGO◎CG-TECH.COM
你起码也要喂它吧 X25045(ASM); * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
; X25045
; 1、WD_RST 看门狗复位子程序
; 2、WD_SET 看门狗定时时间设置子程序
; 3、RD_SR 读状态寄存器子程序
; 4、WR_SR 写状态寄存器子程序
; 5、RD_B 读一个字节数据子程序
; 6、WR_B 写一个字节数据子程序
;* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
CS EQU CS_RAM
SI EQU DATAIN
SO EQU DATAOUT
SCK EQU CLK
WR_: MOV R0,#08H ;写8位数据
WR_1: RLC A
MOV SI,C
CLR SCK
SETB SCK
DJNZ R0,WR_1
RET
RD_: MOV R0,#08H ;读8位数据
RD_1: SETB SCK
CLR SCK
MOV C,SO
RLC A
DJNZ R0,RD_1
RET
;看门狗复位子程序
WD_RST: CLR CS
SETB CS
RET
;看门狗定时时间设置成600ms
WD_SET: MOV R0,#10H ;若将定时时间设为1.4S或200ms，则应送立即
;数#00或#20
LCALL WR_SR
RET
;读状态寄存器子程序，读出的X25045的状态存在A累加器中
RD_SR: MOV A,#05H ;将RDSR命令送A累加器
CLR CS
LCALL WR_
LCALL RD_
SETB CS
RET
;写状态寄存器子程序。F0为写成功与否标志，F0=0，写成功；F0=1，写失败
WR_SR: LCALL RD_SR ;检查WPI位，确定X25045是否正在进行写操作
CLR F0
JNB ACC.0,WR_SR1 ;WPI=0，转写状态寄存器
SETB F0 ;WPI=1，1F0后返回
RET
WR_SR1: CLR CS
MOV A,#06H ;置位写使能寄存器
LCALL WR_
SETB CS
CLR CS
MOV A,#01H ;送写状态寄存器命令
LCALL WR_
MOV A,#18H ;设看门狗定时时间为600ms，块保护地址为
;100H~1FFH
LCALL WR_
CLR CS
SETB CS
RET
;读一个字节数据子程序，待读出数据地址在R3中，读出后的数据存R4
RD_B: LCALL RD_SR
JB ACC.0,RD_B
CLR CS
MOV A,#03H ;送读E2PROM命令，地址在00H~FFH间
LCALL WR_
MOV A,R3 ;送地址
LCALL WR_
LCALL RD_ ;读数据并送R4
MOV R4,A
SETB CS
RET
;写一个字节数据子程序，写入地址在R3中，数据在R4中
WR_B: LCALL RD_SR
JB ACC.0,WR_B
CLR CS
MOV A,#06H ;置位写使能寄存器
LCALL WR_
SETB CS
CLR CS
MOV A,#02H ;送写E2PROM命令，地址在00H~FFH间
LCALL WR_
MOV A,R3 ;送地址
LCALL WR_
MOV A,R4 ;送待写数据
LCALL WR_
CLR CS
SETB CS
RET
X25045(Other ASM);Xicor Application Note AN21-3
$ TITLE(X25043/8031/1.0)
;**************************************************************************
*****
************
*
;* Copyright (c) 1994 Xicor, Inc.
;* AUTHOR: Richard Downing
;**************************************************************************
*****
************
*
;* The purpose of this code is to provide routines to interface the Xicor
X25043 with the 8031
;* microcontroller. The interface uses the 8031's general purpose parallel
port
1 and connects
;* P1.0 to the chip select line (/CS), P1.1 to the serial input data line
(SI),
P1.2 to the
;* serial clock line (SCK) and P1.3 to the serial output data line (SO).
;*
;* All X25043 commands are provided. These are :-;*
;* 1. Set Write Enable Latch
;* 2. Reset Write Enable Latch
;* 3. Write Status Register
;* 4. Read Status Register
;* 5. Single Byte Write
;* 6. Single Byte Read
;* 7. Page Write
;* 8. Sequential Read
;* 9. Reset Watchdog Timer
;*
;* The code writes 00H to the Status Register; reads the Status Register;
writes 11H to
;* address 55H in Byte Mode; performs a single Byte Read from address 55H;
writes 22H,
;* 33H, 44H to addresses 1F0H, 1F1H, 1F2H in Page Mode; performs a
Sequential
Read
;* from addresses 1F0H, 1F1H, 1F2H; and resets watchdog timer. This code
can
also be used with
;* the X25045 which is identical to the X25043, except for its RESET
output
polarity.
;**************************************************************************
*****
************
*
;* CONSTANTS
cs bit P1.0 ; Port 1 bit 0 used for chip select (/CS)
si bit P1.1 ; Port 1 bit 1 used for serial input (CI)
sck bit P1.2 ; Port 1 bit 2 used for serial clock (SCK)
so bit P1.3 ; Port 1 bit 3 used for serial output (SO)
WREN_INST equ 06H ; Write enable latch instruction (WREN)
WRDI_INST equ 04H ; Write disable latch instruction (WRDI)
WRSR_INST equ 01H ; Write status register instruction (WRSR)
RDSR_INST equ 05H ; Read status register instruction (RDSR)
WRITE_INST equ 02H ; Write memory instruction (WRITE)
READ_INST equ 03H ; Read memory instruction (READ)
BYTE_ADDR equ 55H ; Memory address for byte mode operations
BYTE_DATA equ 11H ; Data byte for byte write operation
PAGE_ADDR equ 1F0H ; Memory address for page mode operations
PAGE_DATA1 equ 22H ; 1st data byte for page write operation
PAGE_DATA2 equ 33H ; 2nd data byte for page write operation
PAGE_DATA3 equ 44H ; 3rd data byte for page write operation
STATUS_REG equ 00H ; Status register
;Xicor Application Note AN21-4
MAX_POLL equ 99H ; Maximum number of polls
INIT_STATE equ 09H ; Initialization value for control ports
SLIC equ 030H ; Address location of SLIC
;Xicor Application Note AN21-5
;**************************************************************************
*****
************
*
;* INTERNAL RAM
STACK_TOP equ 060H ; Stack top
;**************************************************************************
*****
************
*
;* CODE
ORG 0000H ; Reset vectors to this location
ljmp main
ORG 0100H
main:
mov SP, #STACK_TOP ; Initialize stack pointer
clr EA ; Disable interupts
mov P1, #INIT_STATE ; Init control lines (/CS & SO =1, SCK & SI =0)
lcall wren_cmd ; Set write enable latch
lcall wrsr_cmd ; Write 00H to status register
lcall wren_cmd ; Set write enable latch
lcall byte_write ; Write 11H to address 55H (Byte Write)
lcall byte_read ; Read from address location 55H (Byte Read)
lcall wren_cmd ; Set write enable latch
lcall page_write ; Page write 22H/33H/44H to addresses 1F0/1/2H
lcall sequ_read ; Seq. Read from address locations 1F0/1/2H
lcall rst_wdog ; Reset Watchdog timer
jmp SLIC
;**************************************************************************
*****
************
*
;* Name: WREN_CMD
;* Description: Set write enable latch
;* Function: This routine sends the command to enable writes to the EEPROM
memory array or
;* status register
;* Calls: outbyt
;* Input: None
;* Outputs: None
;* Register Usage: A
;**************************************************************************
*****
************
*
wren_cmd:
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #WREN_INST
lcall outbyt ; Send WREN instruction
clr sck ; Bring SCK low
setb cs ; Bring /CS high
ret
;Xicor Application Note AN21-6
;**************************************************************************
*****
************
*
;* Name: WRDI_CMD
;* Description: Reset write enable latch
;* Function: This routine sends the command to disable writes to the
EEPROM
memory array or
;* status register
;* Calls: outbyt
;* Input: None
;* Outputs: None
;* Register Usage: A
;**************************************************************************
*****
************
*
wrdi_cmd:
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #WRDI_INST
lcall outbyt ; Send WRDI instruction
clr sck ; Bring SCK low
setb cs ; Bring /CS high
ret
;**************************************************************************
*****
************
*
;* Name: WRSR_CMD
;* Description: Write Status Register
;* Function: This routine sends the command to write the WD0, WD1, BP0 and
BP0
EEPROM
;* bits in the status register
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A
;**************************************************************************
*****
************
*
wrsr_cmd:
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #WRSR_INST
lcall outbyt ; Send WRSR instruction
mov A, #STATUS_REG
lcall outbyt ; Send status register
clr sck ; Bring SCK low
setb cs ; Bring /CS high
lcall wip_poll ; Poll for completion of write cycle
ret
;**************************************************************************
*****
************
*
;* Name: RDSR_CMD
;* Description: Read Status Register
;* Function: This routine sends the command to read the status register
;* Calls: outbyt, inbyt
;* Input: None
;* Outputs: A = status register
;Xicor Application Note AN21-7
;* Register Usage: A
;**************************************************************************
*****
************
*
rdsr_cmd:
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #RDSR_INST
lcall outbyt ; Send RDSR instruction
lcall inbyt ; Read status register
clr sck ; Bring SCK low
setb cs ; Bring /CS high
ret
;**************************************************************************
*****
************
*
;* Name: BYTE_WRITE
;* Description: Single Byte Write
;* Function: This routine sends the command to write a single byte to the
EEPROM memory array
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A, B
;**************************************************************************
*****
************
*
byte_write:
mov DPTR, #BYTE_ADDR ; Set address of byte to be written
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #WRITE_INST
mov B, DPH
mov C, B.0
mov ACC.3, C
lcall outbyt ; Send WRITE instruction including MSB of address
mov A, DPL
lcall outbyt ; Send 8 LSBs of address
mov A, #BYTE_DATA
lcall outbyt ; Send data byte
clr sck ; Bring SCK low
setb cs ; Bring /CS high
lcall wip_poll ; Poll for completion of write cycle
ret
;**************************************************************************
*****
************
*
;* Name: BYTE_READ
;* Description: Single Byte Read
;* Function: This routine sends the command to read a single byte from the
EEPROM memory array
;* Calls: outbyt, inbyt
;* Input: None
;* Outputs: A = read byte
;* Register Usage: A, B
;Xicor Application Note AN21-8
;**************************************************************************
*****
************
*
byte_read:
mov DPTR, #BYTE_ADDR ; Set address of byte to be read
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #READ_INST
mov B, DPH
mov C, B.0
mov ACC.3, C
lcall outbyt ; Send READ instruction including MSB of address
mov A, DPL
lcall outbyt ; Send 8 LSBs of address
lcall inbyt ; Read data byte
clr sck ; Bring SCK low
setb cs ; Bing /CS high
ret
;**************************************************************************
*****
************
*
;* Name: PAGE_WRITE
;* Description: Page Write
;* Function: This routine sends the command to write three consecutive
bytes to
the EEPROM
;* memory array using page mode
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A, B
;**************************************************************************
*****
************
*
page_write:
mov DPTR, #PAGE_ADDR ; Set address of 1st byte to be written
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #WRITE_INST
mov B, DPH
mov C, B.0
mov ACC.3, C
lcall outbyt ; Send WRITE instruction including MSB of address
mov A, DPL
lcall outbyt ; Send 8 LSBs of address
mov A, #PAGE_DATA1
lcall outbyt ; Send 1st data byte
mov A, #PAGE_DATA2
lcall outbyt ; Send 2nd data byte
mov A, #PAGE_DATA3
lcall outbyt ; Send 3rd data byte
clr sck ; Bring SCK low
setb cs ; Bring /CS high
lcall wip_poll ; Poll for completion of write cycle
ret
;Xicor Application Note AN21-9
;**************************************************************************
*****
************
*
;* Name: SEQU_READ
;* Description: Sequential Read
;* Function: This routine sends the command to read three consecutive
bytes
from the EEPROM
;* memory array using sequential mode
;* Calls: outbyt, inbyt
;* Input: None
;* Outputs: A = last byte read
;* Register Usage: A, B
;**************************************************************************
*****
************
*
sequ_read:
mov DPTR, #PAGE_ADDR ; Set address of 1st byte to be read
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #READ_INST
mov B, DPH
mov C, B.0
mov ACC.3, C
lcall outbyt ; Send READ instruction with MSB of address
mov A, DPL
lcall outbyt ; Send low order address byte
lcall inbyt ; Read 1st data byte
lcall inbyt ; Read 2nd data byte
lcall inbyt ; Read 3rd data byte
clr sck ; Bring SCK low
setb cs ; Bring /CS high
ret
;**************************************************************************
*****
************
*
;* Name: RST_WDOG
;* Description: Reset Watchdog Timer
;* Function: This routine resets the watchdog timer without sending a
command
;* Calls: None
;* Input: None
;* Outputs: None
;* Register Usage: None
;**************************************************************************
*****
************
*
rst_wdog:
clr cs ; Bring /CS low to reset watchdog timer
setb cs ; Bring /CS high
ret
;**************************************************************************
*****
************
*
;* Name: WIP_POLL
;* Description: Write-In-Progress Polling
;* Function: This routine polls for completion of a nonvolatile write
cycle by
examining the
;* WIP bit of the status register
;* Calls: rdsr_cmd
;Xicor Application Note AN21-10
;* Input: None
;* Outputs: None
;* Register Usage: R1, A
;**************************************************************************
*****
************
*
wip_poll:
mov R1, #MAX_POLL ; Set maximum number of polls
wip_poll1:
lcall rdsr_cmd ; Read status register
jnb ACC.0, wip_poll2 ; If WIP bit '0' write cycle completed
djnz R1, wip_poll1 ; If WIP bit '1' continue polling
wip_poll2:
ret
;Xicor Application Note AN21-11
;**************************************************************************
*****
************
*
;* Name: OUTBYT
;* Description: Sends byte to EEPROM
;* Function: This routine shifts out a byte, starting with the MSB, to the
EEPROM
;* Calls: None
;* Input: A = byte to be sent
;* Outputs: None
;* Register Usage: R0, A
;**************************************************************************
*****
************
*
outbyt:
mov R0, #08 ; Set bit counter to eight
outbyt1:
clr sck ; Bring SCK low
rlc A ; Shift byte left through carry
mov si, C ; Send data bit in carry
setb sck ; Bring SCK high
djnz R0, outbyt1 ; Finish if last data bit
clr si ; Place SI in known condition
ret
;**************************************************************************
*****
************
*
;* Name: INBYT
;* Description: Recieves byte from EEPROM
;* Function: This routine recieves a byte, MSB first, from the EEPROM
;* Calls: None
;* Input: None
;* Outputs: A = recieved byte
;* Register Usage: R0, A
;**************************************************************************
*****
************
*
inbyt:
mov R0, #08 ; Set bit counter to eight
inbyt1:
setb sck ; Bring SCK high
clr sck ; Bring SCK low
mov C, so ; Receive data bit and store in carry
rlc A ; Shift byte left through carry
djnz R0, inbyt1 ; Finish if last data bit
ret
END
X25045(C)/*
;程 序 最 后 修 改 时 间 0-4-3 23:43
;软 件 标 题：25045操作标准子程序集41
;软 件 说 明：25045 I2C 串行EEPROM 驱动
;_________________________________________
;原作者: 庞波
;程序修改人：
;版本号：
;_________________________________________
*/
/*到现在为止所有的问题都已经解决，此版本已经较为完善*/
# include <stdio.h>
# include <reg52.h>
# define uchar unsigned char
# define uint unsigned int
sbit SO=P1^1;/*25045输出*/
sbit SI=P1^2;/*25045输入*/
sbit SCK=P1^3;/*25045时钟*/
sbit CS=P1^4;/*25045片选*/
uchar code WREN_INST=0X06;
/* Write enable latch instruction (WREN)*/
uchar code WRDI_INST=0X04;
/* Write disable latch instruction (WRDI)*/
uchar code WRSR_INST=0X01;
/* Write status register instruction (WRSR)*/
uchar code RDSR_INST=0X05;
/* Read status register instruction (RDSR)*/
uchar code WRITE_INST=0X02;
/* Write memory instruction (WRITE)*/
/*写入25045的先导字,应当为0000A010,其中的A为写入25045的高位地址
将此WRITE_INST和写入高位地址相或后即为正确的写先导字*/
uchar code READ_INST=0X03;
/* Read memory instruction (READ)*/
/*读出25045的先导字,应当为0000A011,其中的A为读出25045的高位地址
将此READ_INST和读出高位地址相或后即为正确的读先导字*/
uint code BYTE_ADDR=0X55;
/* Memory address for byte mode operations*/
uchar code BYTE_DATA=0X11;
/*Data byte for byte write operation*/
uint code PAGE_ADDR=0X1F;
/* Memory address for page mode operations*/
/*页面写入的其始地址*/
uchar code PAGE_DATA1=0X22;
/* 1st data byte for page write operation*/
uchar code PAGE_DATA2=0X33;
/* 2nd data byte for page write operation*/
uchar code PAGE_DATA3=0X44;
/* 3rd data byte for page write operation*/
uchar code STATUS_REG=0X20;
/* Status register,设置DOG时间设置为200毫秒,无写保护*/
/*这是状态寄存器的值,他的意义在于第5,第4位为WDI1,WDI0代表DOG的时间,00为1.4秒,01
为600毫秒,10为200毫秒,00为disabled
第3位和第2位为BL1,BL0,是写保护设置位,00为无保护,01为保护180-1FF,10为保护100-
1FF,11为保护000-1FF.第1位为WEL,
当他为1时代表已经"写使能"设置了,现在可以写了,只读位.第0位为WIP,当他为1时代表正
在进行写操作,是只读*/
uchar code MAX_POLL=0x99;
/* Maximum number of polls*/
/*最大写过程时间,确定25045的最大的写入过程的时间*/
uchar code INIT_STATE=0x09;
/* Initialization value for control ports*/
uint code SLIC=0x30;
/* Address location of SLIC*/
void wren_cmd(void);/*写使能子程序*/
void wrdi_cmd(void);/*写使能复位*/
void wrsr_cmd(void);/*复位时间位和数据保护位写入状态寄存器*/
uchar rdsr_cmd(void);/*读状态寄存器*/
void byte_write(uchar aa,uint dd);/*字节写入,aa为写入的数据,dd为写入的地址*/
uchar byte_read(uint dd);/*字节读出,dd为读出的地址,返回读出的数据*/
void page_write(uchar aa1,uchar aa2,uchar aa3,uchar aa4,uint dd);/*页写入*/
void sequ_read(void);/*连续读出*/
void rst_wdog(void);/*DOG复位*/
void outbyt(uchar aa);/*输出一个字节到25045中，不包括先导字等*/
uchar inputbyt();/*由25045输入一个字节，不包括先导字等额外的东西*/
void wip_poll(void);/*检查写入过程是否结束*/
/*25045操作子程序集*/
/*;*****************************************************************************
**************
*
;* Name: WREN_CMD
;* Description: Set write enable latch
;* Function: This routine sends the command to enable writes to the EEPROM
memory array or
;* status register
;* Calls: outbyt
;* Input: None
;* Outputs: None
;* Register Usage: A
;*******************************************************************************
************
*/
/*写使能子程序*/
void wren_cmd(void)
{
uchar aa;
SCK=0;/* Bring SCK low */
CS=0;/* Bring /CS low */
aa=WREN_INST;
outbyt(aa);/* Send WREN instruction */
SCK=0;/* Bring SCK low */
CS=1;/* Bring /CS high */
}
/*;*****************************************************************************
**************
*
;* Name: WRDI_CMD
;* Description: Reset write enable latch
;* Function: This routine sends the command to disable writes to the EEPROM
memory array or
;* status register
;* Calls: outbyt
;* Input: None
;* Outputs: None
;* Register Usage: A
;*******************************************************************************
************
*/
/*写使能复位子程序*/
void wrdi_cmd(void)
{
uchar aa;
SCK=0;/* Bring SCK low */
CS=0;/* Bring /CS low */
aa=WRDI_INST;
outbyt(aa);/* Send WRDI instruction */
SCK=0;/* Bring SCK low */
CS=1;/* Bring /CS high */
}
/*;*****************************************************************************
**************
*
;* Name: WRSR_CMD
;* Description: Write Status Register
;* Function: This routine sends the command to write the WD0, WD1, BP0 and BP0
EEPROM
;* bits in the status register
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A
;*******************************************************************************
************
*/
/*写状态寄存器子程序*/
void wrsr_cmd(void)
{
uchar aa;
SCK=0;/* Bring SCK low */
CS=0;/* Bring /CS low */
aa=WRSR_INST;
outbyt(aa) ;/* Send WRSR instruction */
aa=STATUS_REG;
outbyt(aa);/* Send status register */
SCK=0;/* Bring SCK low */
CS=1;/* Bring /CS high */
wip_poll();/* Poll for completion of write cycle */
}
/*;*****************************************************************************
**************
*
;* Name: RDSR_CMD
;* Description: Read Status Register
;* Function: This routine sends the command to read the status register
;* Calls: outbyt, inputbyt
;* Input: None
;* Outputs: A = status registerXicor Application Note AN21
;* Register Usage: A
;*******************************************************************************
************
*/
/*读状态寄存器,读出的数据放入到aa中*/
uchar rdsr_cmd (void)
{
uchar aa;
SCK=0;
CS=0;
aa=RDSR_INST;
outbyt(aa);
aa=inputbyt();
SCK=0;
CS=1;
return aa;
}
/*;*****************************************************************************
**************
*
;* Name: BYTE_WRITE
;* Description: Single Byte Write
;* Function: This routine sends the command to write a single byte to the
EEPROM memory
array
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A, B
;*******************************************************************************
************
*/
/*字节写入,aa为写入的数据,dd为写入的地址,对于25045而言为000-1FF*/
void byte_write(aa,dd)
uchar aa;
uint dd;
{
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|WRITE_INST);/* Send WRITE instruction including
MSB of address */
/*将高位地址左移3位与写入先导字相或,得到正确的先导字写入25045*/
outbyt((uchar)(dd));
/*输出低位地址到25045*/
outbyt(aa);
/*写入数据到25045的对应单元*/
SCK=0;
CS=1;
wip_poll();
/*检测是否写完*/
}
/*;*****************************************************************************
**************
*
;* Name: BYTE_READ
;* Description: Single Byte Read
;* Function: This routine sends the command to read a single byte from the
EEPROM memory
array
;* Calls: outbyt, inputbyt
;* Input: None
;* Outputs: A = read byte
;* Register Usage: A, BXicor Application Note AN21
;*******************************************************************************
************
*/
/*字节读出,其中dd为读出的地址,返回的值为读出的数据*/
uchar byte_read(dd)
uint dd;
{
uchar cc;
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|READ_INST);/* Send READ_INST instruction
including MSB of address */
/*将高位地址左移3位与读出先导字相或,得到正确的先导字写入25045*/
outbyt((uchar)(dd));
/*输出低位地址到25045*/
cc=inputbyt();/*得到读出的数据*/
SCK=0;
CS=1;
return cc;
}
/*;*****************************************************************************
**************
*
;* Name: PAGE_WRITE
;* Description: Page Write
;* Function: This routine sends the command to write three consecutive bytes to
the EEPROM
;* memory array using page mode
;* Calls: outbyt, wip_poll
;* Input: None
;* Outputs: None
;* Register Usage: A, B
;*******************************************************************************
************
*/
/*页面写入,其中aa1,aa2,aa3,aa4为需要写入的4个数据(最大也就只能一次写入4个字,dd为
写入的首地址*/
void page_write(aa1,aa2,aa3,aa4,dd)
uchar aa1,aa2,aa3,aa4;
uint dd;
{
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|WRITE_INST);/* Send WRITE instruction including
MSB of address */
/*将高位地址左移3位与写入先导字相或,得到正确的先导字写入25045*/
outbyt((uchar)(dd));
/*写入低位地址到25045*/
outbyt(aa1);
/*写入数据1到25045的对应单元*/
outbyt(aa2);
/*写入数据2到25045的对应单元*/
outbyt(aa3);
/*写入数据3到25045的对应单元*/
outbyt(aa4);
/*写入数据4到25045的对应单元*/
SCK=0;
CS=1;
wip_poll();
}
/*;*****************************************************************************
**************
*
;* Name: SEQU_READ
;* Description: Sequential Read
;* Function: This routine sends the command to read three consecutive bytes
from the EEPROM
;* memory array using sequential mode
;* Calls: outbyt, inputbyt
;* Input: None
;* Outputs: A = last byte read
;* Register Usage: A, B
;*******************************************************************************
************
*/
/*连续读出,由于函数的返回值只能为1个,对于连续读出的数据只能使用指针作为函数的返
回值才能做到返回一系列的数组*/
/*sequ_read:*/
unsigned int *page_read(n,dd)
uchar n;/*n是希望读出的数据的个数，n<=11*/
unsigned int dd;/*dd是读出数据的首地址*/
{
uchar i;
uchar pp[10];
unsigned int *pt=pp;
SCK=0;
CS=0;
outbyt((((uchar)(dd-0XFF))<<3)|READ_INST);
for (i=0;i<n;i++)
{
pp[i]=inputbyt();
}
return (pt);
}
/*调用的方法如下*/
/*unsigned int *p;*/
/*p=page_read(4,100);*/
/*a=*(p)*/
/*b=*(p+1)*/
/*c=*(p+2)*/
/*d=*(p+3)*/
/*abcd中存放25045中由100地址开始的4个数据*/
/* Send WRITE */
/*mov DPTR, #PAGE_ADDR ; Set address of 1st byte to be read
clr sck ; Bring SCK low
clr cs ; Bring /CS low
mov A, #READ_INST
mov B, DPH
mov C, B.0
mov ACC.3, C
lcall outbyt ; Send READ instruction with MSB of address
mov A, DPL
lcall outbyt ; Send low order address byte
lcall inputbyt ; Read 1st data byte
lcall inputbyt ; Read 2nd data byte
lcall inputbyt ; Read 3rd data byte
clr sck ; Bring SCK low
setb cs ; Bring /CS high
ret*/
/*;*****************************************************************************
**************
*
;* Name: RST_WDOG
;* Description: Reset Watchdog Timer
;* Function: This routine resets the watchdog timer without sending a command
;* Calls: None
;* Input: None
;* Outputs: None
;* Register Usage: None
;*******************************************************************************
************
*/
/*复位DOG*/
void rst_wdog (void)
{
CS=0;
CS=1;
}
/*;*****************************************************************************
**************
*
;* Name: WIP_POLL
;* Description: Write-In-Progress Polling
;* Function: This routine polls for completion of a nonvolatile write cycle by
examining the
;* WIP bit of the status register
;* Calls: rdsr_cmdXicor Application Note AN21
;* Input: None
;* Outputs: None
;* Register Usage: R1, A
;*******************************************************************************
************
*/
/*检测写入的过程是否结束*/
void wip_poll(void)
{
uchar aa;
uchar idata my_flag;
for (aa=1;aa>MAX_POLL;aa++)
{
my_flag=rdsr_cmd();
if ((my_flag&&0x01)==0) {aa=MAX_POLL;}/*判断是否WIP=0,即判断是否写入过程已经结
束,若结束就跳出,否则继续等待直到达到最大记数值*/
}
}
/*;*****************************************************************************
**************
*
;* Name: OUTBYT
;* Description: Sends byte to EEPROM
;* Function: This routine shifts out a byte, starting with the MSB, to the
EEPROM
;* Calls: None
;* Input: A = byte to be sent
;* Outputs: None
;* Register Usage: R0, A
;*******************************************************************************
************
*/
/*输出一个数据到25045,此数据可能为地址,先导字,写入的数据等*/
void outbyt(aa)
uchar aa;
{
uchar my_flag1,i;
for (i=0;i>7;i++)
{
my_flag1=aa;
SCK=0;
SI=(my_flag1>>i);
SCK=1;
}
SI=0;/*使SI处于确定的状态*/
}
/*;*****************************************************************************
**************
*
;* Name: INPUTBYT
;* Description: Recieves byte from EEPROM
;* Function: This routine recieves a byte, MSB first, from the EEPROM
;* Calls: None
;* Input: None
;* Outputs: A = recieved byte
;* Register Usage: R0, A
;*******************************************************************************
************
*/
/*得到一个数据,此数据可能为状态寄存器数据,读出的单元数据等*/
uchar inputbyt(void)
{
uchar aa,my_flag;
char i;
for (i=7;i<0;i--)
{
SCK=0;
my_flag=(uchar)(SO);
SCK=1;
aa=(aa||(my_flag<<i));
my_flag=0x00;
}
return aa;
}
tall meyou know tall me
多谢雄鹰兄！这下我可有救了！多谢多谢！，怎一谢资了得!
雄鹰兄请进雄鹰兄您好，请教您个问题，我现在做的项目中X25045仅作为看门狗复位是用，是不是读写
操作都不需要了？ 只需要复位函数就可以了，如果实这样，又是如何使用的，我有点糊涂
了，
要先启动狗，让它运转起来，然后在使用过程中，你只要片选X25045就可以了，这个片选动作就是喂狗。要先启动狗，让它运转起来，然后在使用过程中，你只要片选X25045就可以了，这个片选动
作就是喂狗。
如何喂狗？？在AT89X51.h声明文件中增加一行 sfr WDTRST = 0xA6;
可以用
Main()
{
WDTRST=0x1E;
WDTRST=0xE1;//初始化看门狗。
While (1)
{
应用程序；//
WDTRST=0x1E;
WDTRST=0xE1;//喂狗指令
}
}在主程序中家 喂狗指令，但是如果主程序是
低功耗模式的，在没有中断的时候
while(1) {
_BIS_SR(LPM3_bits+ GIE); //进入低功耗模式3
// ;//喂狗指令
}
这里的 喂狗指令 不能执行怎么办呢？？？
点击浏览该文件
第11楼: 哦，大家知道吗？X25045不光有狗，还有。。。哦，大家知道吗？X25045不光有狗，还有EPROM
有哪位大虾知道他的用法，告诉小弟哦，如何写操作（用串口）
THANKS！
上面程序里面有啊！你的为什么不看呢？ SFR 的使用问题SFR 的使用不大会，这个是汇编中通用的还是 所有的 C语言中也通用的