please help with simple PICmicro 16F627a Oscillator Circuit

[Mike]

Hi,
I have been trying to find some information how to use only a resistor and capacitor for my oscillator instead of a crystall or ceramic oscillator, I have read that this is possible to do if timimg is not critical. I am very new to micro's and have a working programmer/testboard but would like to make a very simple circuit (preferably with a solderless breadboard) to use my PICs for experimenting, instead of my programmer/testboard(I am getting board with just having leds flash on and off! when I push a button).

On page 96 (98/180) of the data sheet:

http://ww1.microchip.com/downloads/en/DeviceDoc/40044D.pdf

it states that in Register 14-,1 bit 4, 1-0 (FOSC) you can set the oscillator to be an RC oscillator

This is what I would like to do, if possible but I am not sure how to connect a resistor and capcitor by themselves let alone connect them to the PIC.

Also, another option in Register 14 is to use an internal oscillator,does this mean you could just connect your VCC, GND and I/O lines and no oscillator is needed? If so that would be even better.

Any help with this, or direction to where I can find more info would be great.

Mike Rothe





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[Wolfgang Mahringer]

Dear Mike,

it states that in Register 14-,1 bit 4, 1-0 (FOSC) you can set
the oscillator to be an RC oscillator
This is what I would like to do, if possible but I am not sure
how to connect a resistor and capcitor by themselves
let alone connect them to the PIC.

Well, take a look at page 99 of the data sheet, esp. picture 14-5

Also, another option in Register 14 is to use an internal
oscillator,does this mean you could just connect your VCC,
GND and I/O lines and no oscillator is needed?

Thats right.

HTH
Wolfgang