Wake a PIC® from sleep using RB0

'Program History
'Date Author Comments
'29.09.04 JS This program works with original dev board, programming
' 877 via bootloader NO WDT
'30.09.04 JS RB port change interrupt changed to RB0 pin change
' Only 1 sw and 1 led used with led loop indicator
'30.09.04 JS Remove excess code
'30.09.04 JS RB0/INT interrupt working, correct settings for INTCON reg'r
' disable PortB pullups, RB0/INT falling edge as well as
' enabling and clearing the RBO/INT interupt
'
'

Include "PROTON_20.INC"

' Define the pins that are connected to pushbuttons.
' The switch must be connected to PORTB, pin0
Symbol SW1 = PORTB.0


' Define the pins that are connected to LEDs
Symbol LED1 = PORTD.0
Symbol LED2 = PORTD.1


INTCON.4 = 1 ' Enable the RB0/INT interrupt
OPTION_REG = $BF ' Enable PORTB pull-ups (was 7F-0111 1111)
' OPTION_REG.7=1 - Disable PORTB pull-ups
' OPTION_REG.6=0 - RB0/INT falling edge
TRISB = %00001111 ' Set PORTB.0-3 (SWs) to input, 4-7 (LEDs)to output

Output PORTD ' Enable portD to drive leds

'Pull RB4 High
High PORTB.4


'Test leds
LED1 = 1
LED2 = 1
delayms 1000


' MAIN PROGRAM BEGINS HERE
main:

'Leds off
LED1 = 0
LED2 = 0

'Led loop indicator
LED2 = 1
delayms 1000
LED2 = 0


' Check SW1 pressed to toggle on LED
If SW1 = 1 Then LED1 = 1


delayms 5000

INTCON.1 = 0 ' Clear the RB0/INT interrupt

Nap 7 ' Go to sleep. When the watchdog is
' disabled, NAP won't wake up until
' an interrupt occurs.

Goto main ' Do it again upon waking