;***********************************************************************;
;title:      Em78p458/9 comparator test program                         ;
;Description:比较器结果由Port60输出，当R3的bit7为1时，输出high pulse,当R3的 ;
;            bit7为０时，输出low pulse.比较器输出由port57输出与port60一样的 ;
;     　　　　波形。                                                      ;
;Company:    ELAN MICROELECTRONICS (SZ) LTD.INC                         ;
;************************************************************************;

include   "d:\wice\inc\em78_headfile\em78p458.inc"      ;include em78p458 head file
;=================================================================================
dly1    ==   0x30         ;delay register 1
dly2    ==   0x31         ;delay register 2
;----------------------------------------------------------
     org    0
     jmp    start
     org    0x08
     reti
start:
     disi
     mov    a,@0b00000000
     contw                         ;set cont register
     bs     r9,5                   ; register segment
     mov    a,@0b00000000
     iow    ioc51                  ;set port51,52 funtion
     bc     r9,5                   ;
     mov    a,@0b01100000          ;bit6(CE)=1,enable comparator,
                                   ;bit5(coe)=1,set comparator
     iow    ioca0    
     mov    a,@0b01100000
     iow    ioc50                  ;set port56,57 input,
     mov    a,@0b00000000
     iow    ioc60                  ;set port6 output   
start1:    
     mov    a,@0b00010100
     mov    port5,a                ;CIN+<CIN-
     nop
     nop
     call   compout                ;port60 output low
     mov    a,@0x32
     call   delay                  ;delay time 5ms
     ;
     mov    a,@0b00010010
     mov    port5,a                ;CIN+>CIN-
     nop
     nop
     call   compout               ;port60 output high
     mov    a,@0x64
     call   delay                 ;delay time 10ms
    ;
     mov    a,@0b00001100
     mov    port5,a               ;CIN+<CIN-
     nop
     nop
     call   compout              ;Port60 output low
     mov    a,@0x96
     call   delay                ;delay time 15ms      
     ;
     mov    a,@0b00001010
     mov    port5,a
     nop
     nop
     call   compout              ;port60 output high
     mov    a,@0xC8
     call   delay                ;delay time 20ms
     jmp    start1
;--------------------------    
compout:                         ;port60 output subprogram
     jbs    status,7
     jmp    comparator0
comparator1:
     bs    port6,0
     jmp   $+2
comparator0:
     bc    port6,0
     ret
;---------------------   
delay:                          ;delay time subprogram
     mov    dly1,a
delay1:
     mov    a,@0x15               ;100us delay time,4MHz,clock=4
     mov    dly2,a
delay2:    
     djz    dly2
     jmp    delay2
     djz    dly1
     jmp    delay1
     ret
;-----------------
     eop
     end