I'm trying to use RA0 and RA1 as inputs, but I can't get it to work.
They work fine as outputs, no problem. They go high-z when programmed as inputs. As input I have a pullup and switch to ground. I also have a problem turning on the weak pullups on RA0 and RA1 - can't get it to work.
The others, RA2, RA4, RA6 work fine as inputs. I can turn on the weak pullups, no problem. Tried an other 16F630, same picture.
Is there a flaw in the 16F630 or its datasheet? Or something I have overlooked?
-- Thanks, Frank. (remove 'x' and 'invalid' when replying by email)
Perhaps too obvious, but have you set up CMCON correctly?
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Turn off the comparator. CMCON register. Page 39. 6.2.
HTHs GtG
"Spehro Pefhany" schreef in bericht news: snipped-for-privacy@4ax.com...
Bingo! I came across CMCON earlier today, but never gave it a try - it's not very obvious from the PORT A0,A1 'schematic' that CMCON has an effect on using A0,A1 as digital inputs.
Thanks a lot ;)
-- Thanks, Frank. (remove 'x' and 'invalid' when replying by email)
"Grog" schreef in bericht news:D%A2d.33989$ snipped-for-privacy@news-server.bigpond.net.au...
That did the trick. I'll never forget now ;)
-- Thanks, Frank. (remove 'x' and 'invalid' when replying by email)
No problem. PICs generally power up with any port pins that *can* be analog inputs in analog mode (ADC or comparator).
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
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