16F84 pullups

[Oscar]

Just had a project that uses a 16F84 to drive a 4066 cmos switch thru port A fail.
The question is does a 16f84 have internal pullups on port A or only port b.
I cant stick a meter on as things are happening too fast.
Cheers Oscar

[rievax]

Just had a project that uses a 16F84 to drive a 4066 cmos switch thru port A fail.
The question is does a 16f84 have internal pullups on port A or only port b.
I cant stick a meter on as things are happening too fast.
Cheers Oscar

Internal pullups can only be enabled for portB. portA,4 is open drain and cant source current, so it needs an external pullup if used as an output.
Its best to read the data sheet. It has lots of useful info.

[Oscar]

Thanks mate Thats why its not working yet lol