Datasheet

26.9.3 TWI (Slave) Address Register n

Name: TWAR

Offset: 0xBA + n*0x20 [n=0..1]

Reset: 0x02

Property: -

The TWARn should be loaded with the 7-bit Slave address (in the seven most significant bits of TWARn)

to which the TWI n will respond when programmed as a Slave Transmitter or Receiver, and not needed in

the Master modes. In multi-master systems, TWARn must be set in masters which can be addressed as

Slaves by other Masters.

The LSB of TWARn is used to enable recognition of the general call address (0x00). There is an

associated address comparator that looks for the slave address (or general call address if enabled) in the

received serial address. If a match is found, an interrupt request is generated.

Bit 7 6 5 4 3 2 1 0

TWA[6:0] TWGCE

Access

R/W R/W R/W R/W R/W R/W R/W R/W

Reset 0 0 0 0 0 0 1 0

Bits 7:1 – TWA[6:0] TWI (Slave) Address

These seven bits constitute the slave address of the TWI n unit.

Bit 0 – TWGCE TWI General Call Recognition Enable Bit

If set, this bit enables the recognition of a General Call given over the two-wire Serial Bus n.

ATmega328PB

TWI - Two-Wire Serial Interface

Datasheet Complete

DS40001906C-page 330