Schmitt trigger on IRED xmtr

[Michael]

I need to ask also....

On the 16F628a, if I CMCON = 7 to turn the comparators off....
do set TRISA so the xtal pins are inputs?

On my rcrvr, I'm using A0 for SERIN and the xtal is on A6 and A7

so...

TRISA = %11000001 ?

I was also mixed up on the MCLR function.

The 16C65B I've used to date had to have a 4.7k to V+ or they won't function.

I had had MCLR configured as "reset" in the epic software....only to find out it needed to be an "input" for the chip to work.

(I still don't get that one).

[Dave]

Michael, The reset function can be set to internal, leaving the reset pin available for external use. However this pin can only be used as an input pin and has NO output drive capability. Its all in the data sheet for the processor you are using.

Dave Purola,
N8NTA

[Michael]

Thanks Dave, so in EPIC language that means choose "input" ?

When I chose "reset" in the Epic software and had a 4.7K to V+, the PIC wouldn't function at all.

I chose "input" and it works.

So, will the chip reset regardless of which I choose?

I am going to look at my breadboard this morning and hardwire the SEROUT/SERIN to see if it's an infrared problem.....don't know why I didn't think of that yesterday.

It's called middle aged brain atrophy.

It has to be something simple....maybe in my chip setup. I've always used the 16C65B OTP part....this 16F628 is new to me.