Microchip Technology megaAVR 0 Series Manual page 367

24.5.13 Slave Address
Name: SADDR
Offset: 0x0C
Reset: 0x00
Property: -
Bit 7
Access R/W
Reset 0
Bits 7:0 – ADDR[7:0] Address
The Slave Address register in combination with the Slave Address Mask register (TWIn.SADDRMASK) is
used by the slave address match logic to determine if a master TWI device has addressed the TWI slave.
The Slave Address Interrupt Flag (APIF) is set to 1 if the received address is recognized. The slave
address match logic supports recognition of 7- and 10-bits addresses, and general call address.
When using 7-bit or 10-bit Address Recognition mode, the upper seven bits of the Address register
(ADDR[7:1]) represents the slave address and the Least Significant bit (ADDR[0]) is used for general call
address recognition. Setting the ADDR[0] bit, in this case, enables the general call address recognition
logic. The TWI slave address match logic only supports recognition of the first byte of a 10-bit address
(i.e., by setting ADDRA[7:1] = "0b11110aa" where "aa" represents bit 9 and 8, or the slave address). The
second 10-bit address byte must be handled by software.
©
2018 Microchip Technology Inc.
6 5
R/W R/W
0 0
4 3
ADDR[7:0]
R/W R/W
0 0
Datasheet Preliminary
®
megaAVR 0-Series
Two-Wire Interface (TWI)
2 1
R/W R/W
0 0
DS40002015A-page 367
0
R/W
0