15.3.2 Control B

Name: CTRLB
Offset: 0x01
Reset: 0x00
Property: -

Bit 76543210 
    TWI0   USART0 
Access R/WR/W 
Reset 00 

Bit 4 – TWI0 TWI 0 communication

Write this bit to '1' to select alternative communication pins for TWI 0.

Bit 0 – USART0 USART 0 communication

Write this bit to '1' to select alternative communication pins for USART 0.