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seems to be an external ADC on PORTB.0. Setting sampling time, clock source etc... on a 16F628that will be hard
However i don't think it's working like that. If we knew the ADC model, we could elaborate a bit much. Almost sure it's an SPI type... SHIFTIN/SHIFTOUT would help.. but.. i only guess
Last edited by mister_e; - 8th January 2008 at 20:34.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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Yeah sorry guys, should have been a bit clearer! I'm using an external TLC549CP A/D converter which has:
ADC 'data out' pin attached to pin 0 on the pic.
ADC i/o clock pin attached to pin 1 on the pic and..
ADC CS(active) pin attached to pin 2...
Attached to the ADC is a potentiometer which is supplying the variable voltage (0-5V). Throughout my testing I haven't been adjusting it and so the serial output should remain the same if it was working correctly.
Haven't tried SHIFTIN/SHIFTOUT but will have a look into it... cheers!!
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Alex,
When you do something like PORTB = 8, it sets all the pins in PORTB.
Since PORTB.2 is the A/D's Chip Select pin, every time you turn on an LED or Relay, you are also Enabling the A/D converter. Probably getting it confused.
And that chip can be clocked at up to 1 Mhz.
6 seconds is an awful long time to read 8 bits.
<br>
DT
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Hey Darrel,
Thank you loads for your response! I'm currently away from home and so unable to test your theory, but i'm convinced that will be the cause of the issue! I'll keep you updated as to when I can test it and thanks to everyone who helped.
Cheers,
Alex
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