... microcontrollers themselves are inexpensive, and the compilers and programminghardware and software are relatively inexpensive.Atmel AVR MicrocontrollerPrimer: Programming and InterfacingATMEL AVR ARCHITECTURE ... GND, AVCC, and AREF), an external time base (XTAL1 and XTAL2) input pins todrive its clocks, processor reset (active low RESET), and four 8-bit ports (PA0-PA7, PC0-PC7,PB0-PB7, and PD0-PD7), ... already discussed the function of the UDR and the USART baud rateregisters (UBRRH and UBRRL). Note: The USART Control and Status Register C (UCSRC) and the USART baud rate register high (UBRRH)...