;*********************************************************************
;                                                                    *
;     	PIC16C7X Tutorial 5: Watch Dog Reset Timer with Prescalor    *    
;                                                                    *
;*********************************************************************
;*	TARGET PIC16C7X
;*********************************************************************
;*	@version 	0.1, 14 October 2001
;*	@author		James Caska
;*********************************************************************
;*
;*	Runs on Processors without change
;*
;*	PIC16c71
;*	PIC16c715
;*
;*********************************************************************

	#include <p16C71.inc>

	list      p=16C71    

DELAYCOUNTER	EQU	.32     
   
	ORG	.0
START

	;==========================================
	;Autogenerated configuration code PIC16C7X
	;Config Wiz V0.1, www.virtualbreadboard.com
	;==========================================
	;======Begin PORT Configuration
	BSF STATUS,RP0	;Set Bank1
	;======PORT B
	MOVLW   .0	;PORTB Configuration Bits
	MOVWF   TRISB
	BCF STATUS,RP0	;Restore Bank0


	CLRF	PORTB

	GOTO	WDT.Sleep
	

Delay1msapprox
	MOVLW	.255
	MOVWF	DELAYCOUNTER
Delay1msapprox.loop	
	NOP
	DECFSZ	DELAYCOUNTER,F
	GOTO	Delay1msapprox.loop
	RETLW	.0

WDT.TimeOut		
	;==========================================
	;Autogenerated configuration code PIC16C7X
	;Config Wiz V0.1, www.virtualbreadboard.com
	;==========================================
	;======Begin Timer0 Configuration
	;Timer0 Counter Mode, uses External clock source
	;T0SE: TMR0 Source Edge Select bit: Increment on high-to-low transition on T0CKI pin
	;Prescalor Assigned to Watchdog, Timer0 Prescalor = 1:1, WDT Prescalor = 1:2
	MOVLW   .57
	BSF STATUS,RP0	;Option is in Bank1
	MOVWF   OPTION_REG
	BCF STATUS,RP0	;Restore Bank0
	;======End Timer0 Configuration
WDT.TimeOut.doInc
	CALL	Delay1msapprox		;Increment every ms approx	
	INCF	PORTB,F			;Should reach about 36(ms) at 1:2 prescalor before timingout
	GOTO	WDT.TimeOut.doInc	

WDT.Sleep
	;==========================================
	;Autogenerated configuration code PIC16C7X
	;Config Wiz V0.1, www.virtualbreadboard.com
	;==========================================
	;======Begin Timer0 Configuration
	;Timer0 Counter Mode, uses External clock source
	;T0SE: TMR0 Source Edge Select bit: Increment on high-to-low transition on T0CKI pin
	;Prescalor Assigned Timer0, Timer0 Prescalor = 1:2 , Watchdog prescalor 1:1
	MOVLW   .48
	BSF STATUS,RP0	;Option is in Bank1
	MOVWF   OPTION_REG
	BCF STATUS,RP0	;Restore Bank0
	;======End Timer0 Configuration


	MOVLW	.255
	MOVWF	PORTB	;Write PORTB to switch all Pins on
	SLEEP		;Sleeps now until Watch Dog Timeout
	GOTO	WDT.TimeOut

	END