Basics of Sending Data Serially in AVR (ATmega32)
1. Before you start serial communication you have to enable the USART receive r or USART transmitter by writing one to the RXEN or TXEN bit of UCSRB. LDI R16, (1<<TXEN) OUT UCSRB, R16 2. As we mentioned before, in the AVR you can use either synchronous or asynchronous operating mode. The UMSEL bit of the UCSRC register selects the USART operating mode. Since we want to use the Asynchronous USART operating mode, we have to set the UMSEL bit to zero/low. Note: By default, UMSEL is Zero/LOW, so instruction (0<<UMSEL) can be skipped // NOTE: When Writing to USCRC if URSEL = 1, data will go to USCRC, if URSEL = 0, Data will go to BRRH, because BRRH and USCRC share the same address. To set the number of data bits (character size) in a frame you must set the values of the UCSZ1 and USCZ0 bits in the UCSRB and UCSZ2 bits in UCSC. LDI R16, (1<<URSEL)|(1<<UCSZ1)|(1<<UCSZ0)|(0<<UMSEL) OUT UCSRC...