Help with determining the clock speed/instruction cycle time of a PIC16F684

[Steve311]

Hi All; I am a little confused with how to interpret the true time one instruction cycle takes with using a 32kHz internal oscilliator in a PIC16F684.

From what I understand, if I use the 32kHz clock, then each instruction cycle will take 1/32kHz = 32us per instruction cycle. Is this correct? Or is the internal clock divided by 4 which would yield an 8us insruction cycle?

I am trying to figure this out so I can accurately produce various digital output frequencies.

Any help would be appreciated!

Thanks All!
Steve

 

[Mosaic]

The instruction clock is 1/4 the the oscillator speed .

 

[nickelflippr]

I am trying to figure this out so I can accurately produce various digital output frequencies.

Any help would be appreciated!

Thanks All!
Steve

There won't be anything accurate at all with the LFINTOSC, check table 15-2 of the data sheet for what I mean. A better chance would be with the HFINTOSC, if operated under optimal conditions.

 

[MikeMl]

An instruction will take approximately 4X32us = 128us, or 1e6/128 = 7812 instructions/sec