908JK3 - clearing TOF bit.

[JimDandy]

As per the manual:

"Clear TOF by reading the TIM status and control register when TOF is set and then writing a zero to TOF."

Now if the timer has overflowed I have no use for the data it now contains, so to clear the TOF bit do I still have to do a dummy read of TSC and then clear the TOF bit, or can I just clear the TOF bit and be done with it?

[peg]

Hello,

Yes you must still do the read.

However if you use BCLR this is a read-modify-write and so does this in one instruction.

[JimDandy]

Aha!

I was imagining you had to read the whole byte.

Thanks, peg. 

[kef]

And you make CPU reading whole byte. Doing BSET/BCLR CPU still is reading and writing whole memory bytes.