No.35613 作者:snow 邮件:XING3008@TOM.COM ID:12644 登陆:22次 文章数:174篇 最后登陆IP:221.238.212.136 最后登陆:2006/11/13 16:00:23 注册:2003/5/29 11:25:59 财富:676 发帖时间:2003/6/26 10:51:36 发贴者IP:211.102.106.29 标题:snow:帮忙简单看看! 摘要:No.35613帮忙简单看看! 下面这段代码能实现中断嵌套吗? 我想在执行INT1时可以进串口中断 IP=0F0H 可是两种中断无法共存,这是为什么?ORG 0000H LJMP INITIAL ORG 0013H LJMP INTER1 ORG 0023H LJMP UARTI ORG 0030H TAB1: DB 88H,98H,84H,94H,8CH,9CH,82H,92H, 0B0H,0A8H,0B8H,0A4H,0B4H,0ACH,0BCH,0A2H,0BCH TAB2: DB 0C8H,0D8H,0C4H,0D4H,0CCH,0DCH,0C2H,0D2H, 0F0H,0E8H,0F8H,0E4H,0F4H,0ECH,0FCH,0E2H,0BDH ;FLAG EQU 00H INITIAL: MOV SP,#7FH MOV PCON,#00H MOV SCON,#50H MOV TMOD,#20H MOV TH1,#0FDH MOV TL1,#0FDH MOV IP,#0F0H SETB TR1 SETB P2.0 ;SETB P2.1 ; NOP ;CLR P2.0 ;MOV P0,#0BFH ;CLR FLAG CLR P3.5 SETB EA SETB EX1 SETB ES MAIN: CLR P2.0 MOV P0,#0BFH MAIN1: MOV R2,#20 DOG: ;JB FLAG,CLRWAR ;CPL P3.5 CPL P3.4 LCALL DELAY DJNZ R2,DOG CPL P3.5 LJMP MAIN1 ;SJMP DOG ;CLRWAR: ;CLR P2.0 ;MOV P0,#0BFH ;CPL P3.4 ;CPL P3.5 ;CLR FLAG ;SJMP DOG INTER1: CLR EA CLR ES CLR EX1 PUSH ACC PUSH PSW SETB EA SETB ES MOV A,#0FFH MOV SBUF,A SEND: CPL P3.4 JBC TI,SEND1 SJMP SEND SEND1: CLR P2.0 CLEARWAR: CPL P3.4 MOV P0,#0FFH JJJ: JNB P3.3,CLL ; SETB P2.0 ;SETB FLAG LJMP EXIT1 CLL: LCALL DELAY CPL P3.4 LCALL DELAY CPL P3.4 LCALL DELAY CPL P3.4 LCALL DELAY CPL P3.4 LCALL DELAY CPL P3.4 CPL P3.5 LJMP JJJ EXIT1: MOV P0,#0BFH;;;;;;;;;;;;;00000000000;;;;;;;;;; CLR EA CLR ES ;CLR EX1 POP PSW POP ACC ;SETB P2.0 SETB EA SETB EX1 SETB ES RETI UARTI: CLR EA CLR EX1 CLR ES ; MOV R6,#0FFH MOV R7,#10 UART1: CPL P3.4 JBC RI,RECEIVE U1: CPL P3.4 MOV R6,#0FFH U2: DJNZ R6,U2 DJNZ R7,U1 LJMP EXITU RECEIVE: MOV A,SBUF CJNE A,#0AAH,RRNEXT LCALL LOOPHERE LJMP EXITU RRNEXT: ......
>>返回讨论的主题
|