| Home
| Contact
|
Title: Software delay in PIC Microcontrollers
Author: Vincent Wong
Date: 29th March 2005
Below shows the millisecond and microsecond subroutines. You can call the DELAY_1_MS function for a 1ms delay and
DELAY_1_2MS routine for a 1.2ms delay. Other timing can be easily implemented by loading the appropriate values to the working register before calling the
MICROSEC or MSEC subroutines.
MICROSEC:
BCF STATUS,RP0
MOVWF MSEC_REG2
MOVLW 0XFF
MOVWF MSEC_REG
MOVF MSEC_REG2,W
MICROSEC2:
ADDWF MSEC_REG,W
BTFSS STATUS,Z
GOTO MICROSEC2
NOP
NOP
NOP
NOP
RETURN
MSEC: MOVWF MSEC_CTR
MSECLOOP:
MOVLW 0XF8
CALL MICROSEC
NOP
NOP
DECFSZ MSEC_CTR,F
GOTO MSECLOOP
RETURN
DELAY_1_MS:
MOVLW 0XF8 ;1MS
CALL MICROSEC
RETURN
DELAY_1_2MS:
MOVLW D'47' ;200US
CALL MICROSEC
MOVLW 0XF8 ;1MS
CALL MICROSEC
RETURN
| Home
| Top Page
| Contact
|
Copyright Notice: This article, including all text, documents and schematic diagrams, are the intellectual property
of Vincent Wong, and is Copyright (c) 2005. Reproduction or re-publication by any means whatsoever,
whether it is electrical & electronic, mechanical or electro-mechanical, is strictly prohibited under International Copyright laws.
The author (Vincent Wong) grants the reader the right to use this information for personal use only.
Commercial use is prohibited without express written authorisation from Vincent Wong.
Copyright of Vincent Wong. All Rights Reserved.
|
