Help regarding GPIO

elcommselva · ‎2007-01-11

Posted on January 12, 2007 at 07:32

Help regarding GPIO

elcommselva · ‎2007-01-09

Posted on January 10, 2007 at 00:24

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.

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 13:01

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.

elcommselva · ‎2007-01-10

Posted on January 10, 2007 at 23:49

Hi Moderator,

The Problem was with the Standby mode. If I use the LPWFI mode then the problem has been solved. Now the power consumption is 1.5mA. But I have to reduce the consumption to 100-200uA. I have put the MVR off,Flash off and also the oscillator has been put off. No other peripherals are active. Can you just help me out.

Regards,

Selva.

kaouther · ‎2007-01-11

Posted on January 12, 2007 at 07:32

Did you switched off the PLL2?

Are you measuring the current consumption of the STR711 only or on current on all the board?

Could you provide us the date code and all the marking information on the chip package?

Regards.