Pic 16F688 internal oscillator

[bobe6rfe]

My external clock has failed on my renard 64, what is a good setting for the clock and baud rate for the internal oscillator?

 

[budude]

I think it will run at 19.2 w/o the oscillator with RS-232 - I don't think 57K or 115K will work without it. If you can switch to DMX (250K), you can use the 8 Mhz internal oscillator.

 

[dirknerkle]

I believe you can get 38400 baud out of it with the crystal set at 8mhz. But that's about it. You can drop in a pic16F1825 instead and use the internal crystal and still get normal performance, and you need the 1825's firmware as well.

 

[Shockwave]

Why not replace the dead crystal osc instead of trying to change the code?

 

[MartinMueller2003]

Reducing the clock speed can cause some artifacts if you go too low. The CPU is using a large percentage of the computing power and reducing the Osc frequency can put ou into a situation where the CPU cannot keep up with the processing demands.

 

[P. Short]

The biggest issue, I think, is that of baudrate inaccuracy at 57600 baud using the internal clock.