wjs26270420 

 [求助]
请教楼主:下面的程序错在哪里?
LENG1      EQU    20h ;32     ;二进制数位数
LENG2      EQU    4h      ;二进制数字节数
LENG3      EQU    5h      ;BCD码字节数
NUMB1      EQU    28H    ;BCD码起始地址
NUMB2      EQU    23H    ;二进制数起始地址

;=========多字节BCD码转二进制码码==========
PROC   Bcd_Bin
bcd_bin:
            MOV      R7,#LENG1
            CLR      A
            MOV      20H,A
            MOV      21H,A
            MOV      22H,A
            MOV      23H,A
;            mov      28h,#42h
;            mov      27h,#94h
;            mov      26h,#96h
;            mov      25h,#72h
;            mov      24h,#95h
LOOP1:      CLR      C
            MOV      R0,#NUMB1          ;BCD码的起始地址送入"R0"中
            MOV      R6,#LENG3           ;BCD码的字节数送入"R6"中
LOOP2:      MOV      A,@R0
            RRC      A
            PUSH     PSW
            JNB      Acc.3,LOOP3
            CLR      C
            SUBB     A,#03H
LOOP3:      JNB      Acc.7,LOOP4
            CLR      C
            SUBB     A,#30H
LOOP4:      MOV      @R0,A
            DEC      R0
            POP      PSW
            DJNZ     R6,LOOP2
            MOV      R5,#LENG2
            MOV      R1,#NUMB2
            CLR      A
LOOP5:      MOV      A,@R1
            RRC      A
            MOV      @R1,A
            DEC      R1
            DJNZ     R5,LOOP5
            DJNZ     R7,LOOP1
            RET
            END

发表时间:2008年12月11日21:29:39