blink.asm

于ADuC812的智能无功补偿控制器的研制 一种眼科B型超声诊断议 SL11R单片机外部存储器扩展 单片机复位电路...支持键盘双击事件的C程序设计! 一些源程序 FrankLin C51 库函数的一

;======================================================================
;
; Author        : ADI - Apps
;
; Date          : February 2001
;
; File          : Blink.asm
;
; Description   : Blink LED with 100mSec delay for MicroConverter DEMO            
;
;======================================================================
;       
$MOD814 				; Use 8052 predefined Symbols

CSEG					; Defines the following as a segment of code

ORG     0000H				; Load Code at '0'	

		JMP     MAIN		; Jump to MAIN

ORG 004Bh				; Subroutines


;------------------------------------------------------------------

DELAY:					; Delays by 100ms * A
					; 100mSec based on 2.097152MHZ 
					; Core Clock 
					; i.e. default ADuC814 Clock

		MOV	R0,A		; Acc holds delay variable
 DLY0:		MOV	R1,#022h	; Set up delay loop0
 DLY1:		MOV	R2,#0FFh	; Set up delay loop1
		DJNZ	R2,$		; Dec R2 until R2 is zero
		DJNZ	R1,DLY1         ; Dec R1 & Jump DLY1 until R1 is 0
		DJNZ	R0,DLY0		; Dec R0 & Jump DLY0 until R0 is 0
		RET			; Return from subroutine
;======================================================================

MAIN:						; (main program)

		MOV	A,#01H			; Set up delay = A*100mSecs.
BLINK:		CPL	P3.3			; blink LED using compliment instruction
		CALL 	DELAY			; Call Software delay 100mS
		JMP	BLINK			; Jump to Blink

END