count-ontime.asm

来自「34个单片机的设计资料」· 汇编 代码 · 共 47 行

TCOUNT2S	EQU 30H 
TCNT02S			EQU 31H 
ID		EQU 32H 
		ORG 00H 
		LJMP START 
		ORG 0BH 
		LJMP INT_T0 
START:	MOV TCOUNT2S,#00H 
				MOV TCNT02S,#00H 
				MOV ID,#00H 
		MOV TMOD,#01H 
		MOV TH0,#(65536-50000) / 256 
		MOV TL0,#(65536-50000) MOD 256 
		SETB TR0 
		SETB ET0 
		SETB EA 
		SJMP $ 
INT_T0:	MOV TH0,#(65536-50000) / 256 
		MOV TL0,#(65536-50000) MOD 256 
		INC TCOUNT2S 
		MOV A,TCOUNT2S 
		CJNE A,#40,NEXT 
		MOV TCOUNT2S,#00H 
		INC ID 
		MOV A,ID 
		CJNE A,#04H,NEXT 
		MOV ID,#00H 
NEXT:			INC TCNT02S 
		MOV A,TCNT02S 
		CJNE A,#4,DONE 
		MOV TCNT02S,#00H 
		MOV A,ID 
		CJNE A,#00H,SID1 
		CPL P1.0 
		SJMP DONE 
SID1:			CJNE A,#01H,SID2 
		CPL P1.1 
		SJMP DONE 
SID2:	CJNE A,#02H,SID3 
		CPL P1.2 
		SJMP DONE 
SID3:			CJNE A,#03H,SID4 
		CPL P1.3 
SID4:			SJMP DONE 
DONE:	RETI 
		END