he18.asm

来自「51系列单片机的汇编程序包」· 汇编 代码 · 共 54 行

;========= 硬件实验十八 串并转换实验========

TIMER   EQU 01H

        org 0
        ljmp 0f30h

        org 000bh
        ljmp int_t0

        ORG 0F30h
        LJMP JG4B6
        ORG 04B6H
JG4B6:  MOV SP,#53H
        MOV TMOD,#01H
        MOV TL0,#00H
        MOV TH0,#4BH
        MOV R0,#00H
        MOV TIMER,#20H
        MOV SCON,#00H
        CLR TI
        CLR RI
        SETB TR0
        SETB ET0
        SETB EA
        SJMP $

INT_T0: PUSH ACC
        PUSH PSW
        CLR EA
        CLR TR0
        MOV TL0,#00H
        MOV TH0,#4BH
        SETB TR0
        DJNZ TIMER,EXIT
        MOV TIMER,#20H
        MOV DPTR,#CDATA
        MOV A,R0
        MOVC A,@A+DPTR
        CLR TI
        CPL A
        MOV SBUF,A
        INC R0
        CJNE R0,#0AH,EXIT
        MOV R0,#00H
EXIT:   SETB EA
        POP PSW
        POP ACC
        RETI

CDATA:  DB 03H,9FH,25H,0DH,99H,49H,41H,1FH,01H,09H

        END