Help Regarding GPIO

elcommselva · ‎2007-01-10

Posted on January 10, 2007 at 12:58

Help Regarding GPIO

elcommselva · ‎2007-01-09

Posted on January 10, 2007 at 03:43

Hi all,

I'm using the STR711FR2T6 Microcontroller for my Hand Held Device. As it is a hand held device power consumption matters a lot. I have to put the Oscillator in the standby mode [in the Sleep Mode] so that the power consumption will be reduced. I have to make the standby pin of the oscillator LOW in order to bring it to standby state. For this purpose I'm making a GPIO pin LOW. But it is not able to bring the oscillator into the stanby state.

When the GPIO pin is not connected to the standby pin of the oscillator, the Voltage at the Control Pin is 0V when I make it LOW.

But when the GPIO Pin is connected to the Standby pin of the Oscillator,the Voltage is 1.25V when I make it LOW.

The oscillator I'm Using: ECS-3951M.

The Port Pins I tried with: P0.9 & P1.15[I config them as PushPull output]

Help me out.

Regards,

Selva.

kaouther · ‎2007-01-10

Posted on January 10, 2007 at 12:58

Hi Selva,

The port pin configuratiion is correct, as I have already used a port pin to disable the main oscillator during low power modes and didn't faced this problem. it seems to be problem with the oscillator used. did you tried another oscillator? I'm using the HXO-36B 4.000.Mhz.