What baud rate the program sets for serial communication? How many seconds it takes to send or receive one full byte? Show calculations. [10 points] [5 points] 2. Explain what is the purpose of lines UCSRA=0x00; and UCSRB=0x58; in the code? 3. Which pin of PORTB toggles if the program receives character *Z'? [5 points] 4. The program uses polling method to receive data serially, re-write the code for interrupt-based receiving of data. Use Receive Complete Interrupt. [15 points] 1. // Problem 2 code #define F_CPU 16000000UL #include #include void main(void) { char ch; UCSRA=0x00; UCSRB=0x58; UBRRH 0x00; UBRRL-OXOF; DDRB=0xFF; sei(); while (1) { if (UCSRA & 0x80) { ch - UDR; switch (ch) { } case 'a': case 'b': default: PORTB = PORTB^0x10; break; PORTBPORTB^0x20; break; PORTB = PORTB^0x40;