blink.asm

来自「8051试验程序 基础教材」· 汇编 代码 · 共 80 行

;-----------------------------------------------------------------------------
;  Copyright (C) 2005 Silicon Laboratories, Inc.
;  All rights reserved.
;
;
;
;  FILE NAME   :  BLINK.ASM
;  TARGET MCU  :  C8051F2xx
;  DESCRIPTION :  This program illustrates how to disable the watchdog timer,
;                 configure a port and write to a port I/O pin.
;
; 	NOTES:
;
;-----------------------------------------------------------------------------

;TARGET MCU  : C8051F206, 'F220, 'F221, 'F226, 'F230, 'F231 and F236.
;Uncomment to include SFR declarations for desired derivative

#include <ioC8051F206.h>                    ; SFR declarations
;#include <ioC8051F220.h>                    ; SFR declarations
;#include <ioC8051F221.h>                    ; SFR declarations
;#include <ioC8051F226.h>                    ; SFR declarations
;#include <ioC8051F230.h>                    ; SFR declarations
;#include <ioC8051F231.h>                    ; SFR declarations
;#include <ioC8051F236.h>                    ; SFR declarations

;-----------------------------------------------------------------------------
; EQUATES
;-----------------------------------------------------------------------------

GREEN_LED      equ   P2.4              ; Port I/O pin connected to Green LED.	

;-----------------------------------------------------------------------------
; RESET and INTERRUPT VECTORS
;-----------------------------------------------------------------------------

               ; Reset Vector
               ASEGN CSEG01:CODE,0
               ljmp Main               ; Locate a jump to the start of code at
                                       ; the reset vector.

;-----------------------------------------------------------------------------
; CODE SEGMENT
;-----------------------------------------------------------------------------


               RSEG BLINK:CODE      ;Switch to code segement using register bank 0 (by default)

Main:          ; Disable the WDT. (IRQs not enabled at this point.)
               ; If interrupts were enabled, we would need to explicitly
               ; disable them so that the 2nd move to WDTCN occurs no more
               ; than four clock cycles after the first move to WDTCN.

               mov   WDTCN, #0DEh
               mov   WDTCN, #0ADh

               ; Set P2.4 (LED) as digital output in push-pull mode.
               orl   PRT2CF, #10h	
               orl   P2MODE, #10h

               ; Initialize LED to OFF
               clr   GREEN_LED

               ; Simple delay loop.
Loop2:         mov   R7, #03h			
Loop1:         mov   R6, #00h
Loop0:         mov   R5, #00h
               djnz  R5, $
               djnz  R6, Loop0
               djnz  R7, Loop1
               cpl   GREEN_LED         ; Toggle LED.
               jmp   Loop2


;-----------------------------------------------------------------------------
; End of file.

               END