dly4ms.inc

来自「PIC单片机指令集」· INC 代码 · 共 29 行

;-----------------------------------------------;
;						;
;#INCLUDE <DLY4mS.INC>				;
;						;
;;	delay 4 msec				;
;;	for 16 MHz				;
;===============================================;
;
;	define RAM
;
	CBLOCK		
	 R0_DLY4mS, R1_DLY4mS
	ENDC
;
DLY4mS:	
	MOVLW 20		; 20*200uS=4mS
	MOVWF R1_DLY4mS
DLY4mS1:
	MOVLW 200		; 200*1uS=200uS
	MOVWF R0_DLY4mS
DLY4mS2:
	NOP			; 1ck
	DECFSZ R0_DLY4mS	; 1ck
	GOTO   DLY4mS2		; 2ck(totaly 4 ck=1uS)
;
	DECFSZ R1_DLY4mS
	GOTO   DLY4mS1
	RETURN