就是因为保护才出问题吧
R1保护，在接受第二个字节时，它已变化，以至于不能发送
可是我改了，还是有问题
UART: PUSH ACC
PUSH PSW
PUSH 01H
JBC TI,OVER ;UART INTERRUPT
WAIT: JBC RI,READ
AJMP WAIT
READ: MOV R2,#1AH
MOV R0,#40H
MOV R3,#80H
JB 00H,REC
MOV A,SBUF
CJNE A,30H,OUT
SETB 00H
MOV A,R3
MOV R4,A
LJMP OUT
REC: MOV A,R4
MOV R1,A
MOV A,SBUF
MOV @R1,A
MOV A,R4
ADD A,#01H
MOV R4,A
CJNE R4,#81H,OUT
CLR 00H
SETB P3.2
CLR P3.3
MOV A,30H
MOV SBUF,A
DEC R2
LJMP OUT
CON: ;CLR TB8
MOV A,@R0
MOV SBUF,A
INC R0
LJMP OUT
OVER: DJNZ R2,CON
OUT: POP 01H
POP PSW
POP ACC
RETI
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楼主
发表于 2007-10-26 13:39
