12F629 Wakes only once

[jderson]

Sorry Bruce, I made both changes, and the results are the same. I get one long pulse on the LED, LED goes off until button is pressed, then short pulse and then off again. Next press of button does nothing.

[Bruce]

Strange. This works precisely as expected. No matter how many times I press/release the
switch.

@ DEVICE MCLR_OFF, INTRC_OSC_NOCLKOUT, WDT_OFF, BOD_OFF, PWRT_ON, PROTECT_OFF
DEFINE OSCCAL_1K 1

CMCON = 7
TRISIO = %001100
OPTION_REG = %01000000
GPIO = 0
T1CON = 0

'GPIO.0 =
'GPIO.1 = LED HIGH OUT
'GPIO.2 = SWITCH HIGH INPUT
'GPIO.3 = MCLR TIED HIGH
'GPIO.4 =
'GPIO.5 =

Main:
    HIGH GPIO.1 
    PAUSE 1000
    LOW GPIO.1 
    
    INTCON.1 = 0
    INTCON.4 = 1
    FLAGS = 0
    @ SLEEP
    @ NOP
    
    INTCON.1 = 0
    HIGH GPIO.1
    PAUSE 100
    LOW GPIO.1
    
    INTCON.1 = 0
    INTCON.4 = 1
    FLAGS = 0
    @ SLEEP
    @ NOP
    HIGH GPIO.1
    PAUSE 1000
    GOTO Main
    
    END

10K pull-down to ground on GPIO.2 with switch pulling it to Vcc on press.

[jderson]

Strange indeed. I programmed my part with your program using cut & paste, and my results are the same as they were, no second operation! It must be some sort of hardware anomaly. I will chase it with my scope later.

[Bruce]

Try setting bit 7 in OPTION_REG to disable internal pull-ups. WPU powers-up with all internal
pull-ups enabled, and with OPTION_REG = %01000000 you'll have internal pull-ups ON.

I suspect it works on mine due to a slight difference in the internal pull-up. That should cure
it unless you have a problem with your switch circuit.

[nomad]

trying to use "temp = GPIO.2" without declaring the temp variable is probably your syntax error.

"temp var byte" (word whatever) near/at the beginning would solve that.

[jderson]

Thanks for your help, guys! OPTION_REG = %1100000 solves the problem. But why does it work the first time, and not the second time????

[Pic2008]

Sounds weird to me, have you tried using another chip, is it the same result too?