ATMEGA2561V ATMEL [ATMEL Corporation], ATMEGA2561V Datasheet - Page 274

• Manufacturer Part Number: ATMEGA2561V
• Description: 8-bit Microcontroller with 64K/128K/256K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

TWAMR – TWI (Slave)
Address Mask Register
274
ATmega640/1280/1281/2560/2561
• Bit 0 – TWGCE: TWI General Call Recognition Enable Bit
If set, this bit enables the recognition of a General Call given over the 2-wire Serial Bus.
• Bits 7:1 – TWAM: TWI Address Mask
The TWAMR can be loaded with a 7-bit Slave Address mask. Each of the bits in
TWAMR can mask (disable) the corresponding address bit in the TWI Address Register
(TWAR). If the mask bit is set to one then the address match logic ignores the compare
between the incoming address bit and the corresponding bit in TWAR. Figure 111
shows the address match logic in detail.
Figure 111. TWI Address Match Logic, Block Diagram
• Bit 0 – Res: Reserved Bit
This bit is reserved and will always read as zero.
Bit
(0xBD)
Read/Write
Initial Value
TWAMR0
Address
TWAR0
Bit 0
R/W
7
0
R/W
Address Bit Comparator 6..1
6
0
R/W
Address Bit Comparator 0
5
0
TWAM[6:0]
R/W
4
0
R/W
3
0
R/W
2
0
R/W
1
0
R
0
–
0
2549K–AVR–01/07
Address
Match
TWAMR