AVR-Chat

--- In AVR-Chat@yahoogroups.com, James Wagner <wagnerj@...> wrote:

> Check that you are loading the dual 8-bit registers in the correct  
> ORDER. There IS a required order so that an internal "temp" register  
> can load both registers in a single operation. Do a doc search for 16  
> bit register or something like that.
> 
> Jim
>

nope.  wrote a little piece of code that loaded the OCR1A register,
then set WGM11:0 and CS12:0 in TCCR1B, then dumped OCR1A out the USART
and the high order byte was cleared.

did it again except set WGM11:0 in TCCR1B, then loaded the OCR1A
register, then set CS12:0 in TCCR1B, then dumped OCR1A out the USART
and this time the high order byte was as i had set it.

in both cases WGM13:0 was set to 15, CS12:0 to 5, and OCR1A to 8333 in
an attempt to get TOV1 set at about 30Hz.  register access was taken
care of by gcc.

i is well and truly perplexed.