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The compatibility mode is set with one of the fuse bits.

Jim


On Sat, 4 Feb 2006 00:01:30 -0800 (PST)
 pinky elodia <sima_zafrani@yahoo.com> wrote:
> hi....
>   i got confuse with usart...
>   i'm using atmega128, i hve use pin2&pin3(mosi&miso) for
> download program...i believe in atmega128 its call
> usart0.
>   in datasheet said that 
>   "in atmega103 compatibility mode, usart1 is not
> available, neither is the UBRR0H or UCRS0C registers.
> this means that in atmega103 compatibility mode,atmega128
> supports asynchronous operation of USART0 only".
>   quite confuse with his statement, how i can know which
> mode i'm using, atmeg128 or atmega103? i'm using ponyprog
> for load the program.
>    
>   for register, they are 0 and 1
> like(UBRR1H,UBRR0H,UCSR0B,UCSR1B) say that if i use
> usart1, for UCSRA....which i should use, UCSR1A or
> UCSR0A? UCSR1A, am i right?
>   thanks for ur concern..............
> 
> 			
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