876A startup issue with PortC

[modifyit]

Thanks for the quick response,

I've tried this on a 866 chip as well using its internal oscillator with the same results.

Are you saying that until the chip's oscillator settles or the Brown Out Detect Power Up Timer (which I am using) starts the pic that these pins are going to be high no matter what?

My issue is I am driving a mosfet with these pins and the split second startup issue causes the mos to conduct which is not desirable if I can help it.

Is there anyway to force the port definition to be the first thing that happens in the code other then making it the first item in the pbp code?

Thanks again

[paul borgmeier]

All pins are inputs on power up - how about adding weak pull-downs to these pins to hold them low - you can then take charge with code. In this manner, they will be low during the power up process.

[modifyit]

I don't have a week pull down, so I will definitely be trying that.

What has me confused is the simulator showing the pin being high.

[peterdeco1]

I had the same problem with a 16F819. I turned off the powerup timer & it went away.

[paul borgmeier]

PORTC = xxxxxxxx on POR or BOR (see datasheet as Skimask would say)
where x = unknown (versus a known 1 or 0)

Your simulator is probably set to let unknows be high since it has to be one or the other.