AVR-Chat

I considered using the USI of the Tiny26 as a UART but abandoned the 
idea as too complex.  It would be better to use simple 'bit-banging' 
code for a 'softUART' that is already written.  
  Atmel's ap note on using the USI as a UART mentioned loading the 
start bit only into the USI serial register and transmitting it.  
Then the eight bit data followed by the stop bit.  Three seperate 
interrupt modes for the USI.  Then, they mentioned in passing at the 
end, you need to first invert the order of the bits in the byte 
because the USI transmits the most-significant bit first while a UART 
sends the least significant bit first.
  If you need both a UART and a SPI/I2C, then either a Tiny2313 or a 
Mega48 might be a better alterative model than the Tiny26.  The 
Mega48 has the ADC like the Tiny26.  Digikey has the Mega48 for 
$1.69, the Tiny26 for $1.55, and the Tiny2313 for $1.42 each in 
quantity 25 - DIP packages.

Alan Probandt
Portland, Oregon