16F819 setting frequency for internal oscillator

[Blair Allen]

I am tring to set the oscillator frequency when using the fuse INTRC_IO for the 16F819. I am not sure how to write to OSCCON to set the frequency. Another question is when I am running in stand-alone am I able to use RB4 as an I/O?
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This message was ported from CCS's old forum
Original Post ID: 144515034

[allen_m]

:=I am tring to set the oscillator frequency when using the fuse INTRC_IO for the 16F819. I am not sure how to write to OSCCON to set the frequency. Another question is when I am running in stand-alone am I able to use RB4 as an I/O?

To set OSCTUNE do the following in the definition / preamble area

#byte OSCCON = 0x8F; // set the address

Then early in main set it to the frequency you wish ...

OSCCON = 0x70; // 8MHz operation

Re RB4, yes you can use it as IO (by standalone I assume you mean no I2c or SPI).

Allen M.
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This message was ported from CCS's old forum
Original Post ID: 144515037