AVR-Chat

Which controller are you using?


REB


bobby cossum wrote:
> --- 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.
>
>   


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