I use GPIO1 to wake up PXA270 from sleep mode.And GPIO0 is connected
to CS8900A's INT pin.When getting into sleep mode,I cut off the power
supply to cs8900a.So GPIO0 is pulled to low.When I push the key to
make a falling edge to GPIO1.PWR_EN is enabled,but no program execute.
If I do not cut off the power supply to cs8900a(GPIO0 is not pulled
down).System is successfully waked up.
Why?Who can help me?

Re: Why GPIO1 cannot wake up pxa270? by shofar

shofar
Thu Apr 05 21:01:26 CDT 2007

And if I set PGSR0=0x1 to make GPIO0 output 1,system is also waked up
successfully even I cut off the power supply of CS8900A.
So Does GPIO0 must not be pulled down if I want to wake up PXA270 from
sleep mode using GPIO1?


Re: Why GPIO1 cannot wake up pxa270? by shofar

shofar
Fri Apr 06 03:22:19 CDT 2007

Something very strange is that if I pull up the GPIO0 pin to VCC_RTC
with a 10K resistor,CPU waked up successfully and code executed.Why?
GPIO0 has some special characteristic?