ATmega48PA Automotive Atmel Corporation, ATmega48PA Automotive Datasheet - Page 243
![no-image](/images/manufacturer_photos/0/0/79/atmel_corporation_sml.jpg)
ATmega48PA Automotive
Manufacturer Part Number
ATmega48PA Automotive
Description
Manufacturer
Atmel Corporation
- Current page: 243 of 371
- Download datasheet (12Mb)
22.9.5
22.9.6
9223B–AVR–09/11
TWAR – TWI (Slave) Address Register
TWAMR – TWI (Slave) Address Mask Register
The TWAR should be loaded with the 7-bit Slave address (in the seven most significant bits of
TWAR) to which the TWI will respond when programmed as a Slave Transmitter or Receiver,
and not needed in the Master modes. In multi master systems, TWAR must be set in masters
which can be addressed as Slaves by other Masters.
The LSB of TWAR 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.
• Bits 7:1 – TWA: TWI (Slave) Address Register
These seven bits constitute the slave address of the TWI unit.
• 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 Salve Address mask. Each of the bits in TWAMR can
mask (disable) the corresponding address bits 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.
in detail.
Figure 22-22. TWI Address Match Logic, Block Diagram
• Bit 0 – Reserved
This bit is an unused bit in the Atmel
zero.
Bit
(0xBA)
Read/Write
Initial Value
Bit
(0xBD)
Read/Write
Initial Value
Atmel ATmega48PA/88PA/168PA [Preliminary]
TWAMR0
Address
TWAR0
Bit 0
TWA6
R/W
R/W
7
1
7
0
TWA5
R/W
R/W
6
0
6
1
Address Bit Comparator 6..1
TWA4
R/W
R/W
Address Bit Comparator 0
5
0
5
1
®
ATmega48PA/88PA/168PA, and will always read as
TWAM[6:0]
TWA3
R/W
R/W
4
0
4
1
Figure 22-22
TWA2
R/W
R/W
3
1
3
0
TWA1
R/W
R/W
2
1
2
0
shown the address match logic
TWA0
R/W
R/W
1
0
1
1
TWGCE
R/W
R
0
–
0
0
0
Address
Match
TWAMR
TWAR
243
Related parts for ATmega48PA Automotive
Image
Part Number
Description
Manufacturer
Datasheet
Request
R
![ATmega48PA](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![ATMEGA48PA-15MZ](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
ATMEL Corporation
Datasheet:
![ATMEGA48P-20MU](/photos/12/13/121314/atmega48p-20mu_tmb.jpg)
Part Number:
Description:
MCU AVR 4K ISP FLASH 20MHZ 32QFN
Manufacturer:
Atmel
Datasheet:
![ATmega48P](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Manufacturer:
Atmel Corporation
Datasheet:
![ATMEGA48P-20AU](/photos/6/91/69154/313-32-tqfp_tmb.jpg)
Part Number:
Description:
MCU AVR 4K ISP FLSH 20MHZ 32TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20PU](/photos/7/21/72189/453-28-dip_tmb.jpg)
Part Number:
Description:
MCU AVR 4K ISP FLASH 20MHZ 28DIP
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20AUR](/photos/6/91/69154/313-32-tqfp_tmb.jpg)
Part Number:
Description:
MCU AVR 4K FLASH 20MHZ 32TQFP
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20MUR](/images/manufacturer_photos/0/0/78/atmel_tmb.jpg)
Part Number:
Description:
MCU AVR 4K FLASH 20MHZ 32QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20MMU](/photos/12/32/123209/28m1-vqfn_tmb.jpg)
Part Number:
Description:
MCU AVR 4K FLASH 20MHZ 28-QFN
Manufacturer:
Atmel
Datasheet:
![ATMEGA48P-20MMUR](/photos/12/32/123209/28m1-vqfn_tmb.jpg)
Part Number:
Description:
MCU AVR 4K FLASH 20MHZ 28QFN
Manufacturer:
Atmel
Datasheet:
![U641B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
INTERVAL AND WIPE/WASH WIPER CONTROL IC WITH DELAY
Manufacturer:
ATMEL Corporation
Datasheet:
![U4082B](/images/manufacturer_photos/0/0/79/atmel_corporation_tmb.jpg)
Part Number:
Description:
Low-Voltage Voice-Switched IC for Hands-Free Operation
Manufacturer:
ATMEL Corporation
Datasheet: