50ms延时程序 ■设单片机的晶振为12MHz ORG 0300H 周期数 MOVR7,#200 1 DELAY1: MOVR6,#125 DELAY2: DJNZ R6,DELAY2 2 DJNZ R7,DELAYI- 2 RET 250ms延时程序 „ 设单片机的晶振为 设单片机的晶振为12MHz ORG 0300H 周期数 MOV R7, #200 1 DELAY1: MOV R6, #125 1 DELAY2: DJNZ R6, DELAY2 2 DJNZ R7, DELAY1 2 RET 2