PIC10f222

[smomenouns]

Hi friends
I am trying to wake up PIC10F222 from sleep mode. I am using PCWHD compiler version 4.07 and I am trying to wake him up by a change on input pin B0. Is there any special setting that I need to use or just simply I go to sleep mode by using "sleep()" function and then I will wake up by change on pin B0 status level.
Any help is greatly appreciated
here is the test code that I am using
[void main()
{
int i;

// setup_adc_ports(NO_ANALOGS);
//setup_adc(ADC_OFF);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);

// TODO: USER CODE!!
input(PIN_B0);
while(1)
{
for(i=0;i<100;i++)
{
output_high(PIN_B2);
delay_ms(100);
output_low(PIN_B2);
delay_ms(100);
}
sleep();
}

}]

it goes to sleep mode, but it doesnt come out whan i change the pin B0 status from high to low.

Thanks
Shahram[/code]

[Guest_7068]

Try making a call to this function before entering the while loop:

[smomenouns]

[Wayne_]

Not sure about the PIC10F222 without looking at data sheets etc but.

You need to enable interrupts as this is what wakes the pic up.
You may not need to specify an interrupt handler but it may be best to:-

[Ttelmah]

No.
There are two ways of using interrupts to wake from sleep:
1) Enable the interrupts.
With this done, operation _will_ branch to the interrupt handler on the next instruction after waking. You absolutely _must_ have an interrupt handler if this is done. However it is not necessary for wake up.
2) Don't enable the interrupts.
With this done, the chip will wake up, but _not_ branch.
The interrupt flag being set, is a hardware event, and _still happens_, even if the interrupt is not enabled. 'Enabling' an interrupt, allows this specific interrupt to be routed to the hardware to trigger the interrupt branch. The global enable, turns on the final output from this hardware. The interrupt branching hardware, is _not_ involved in the wake up, so the interrupt can be left disabled.
Key though, is that a wake event _will not happen_, if the interrupt is already set when you go to sleep. Hence you _must_ clear the interrupt the instruction before the sleep (or verify that it is clear). The chips have a 'neat' feature, that when an interrupt is cleared, it _cannot_ be set again, till after the next instruction. This is deliberately done, so you can execute:

[Matro]

Have a look at page 17 of the datasheet.
You need to enable the wake-up on change (and eventually pull-ups).
To do so, add in your initialization code :