intr1.asm

本文件包包括8051彻底研究书籍各章的实例源代码

;PROGRAM NAME:INTR1.ASM
;TEST TIMER0 INTERRUPT(MODE 1)
;
COUNT   EQU     9217    ;10mS FOR XTAL=11.0592MHz
CHK_BIT REG   P3.2
;
        ORG     0000H
        LJMP    RESET
        ORG     0003H           ;INT0 INTERRUPT
        RETI
        ORG     000BH           ;TIMER0 INTERRUPT
        LJMP    INT_TIMER0
        ORG     0013H           ;INT1 INTERRUPT
        RETI
        ORG     001BH           ;TIMER1 INTERRUPT
        RETI
        ORG     0023H           ;SERIAL INTERRUPT
        RETI
;
RESET   MOV     R0,#00H
        DJNZ    R0,$    ;WAIT
        CLR     CHK_BIT
        MOV     SP,#40H
;
        MOV     A,TMOD
        ANL     A,#11110000B
        CLR     ACC.3   ;GATE=0
        CLR     ACC.2   ;C/T=0
        CLR     ACC.1   ;TIMER0 M1=0
        SETB    ACC.0   ;TIMER0 M0=1
        MOV     TMOD,A
        MOV     TH0,#(65536-COUNT)/256
        MOV     TL0,#(65536-COUNT).MOD.256
        CLR     TF0     ;CLEAR TF0
        SETB    TR0
;
        SETB    PT0
        SETB    ET0     ;ENABLE TIMER0 INTURRUPT
        SETB    EA      ;ENABLE SYSTEM INTERRUPT
;
LOOP    SJMP    LOOP
;
;TF0=1
INT_TIMER0
        CPL     CHK_BIT
        CLR     TF0     ;CLEAR TF0
        MOV     TH0,#(65536-COUNT)/256
        MOV     TL0,#(65536-COUNT).MOD.256
        RETI
;