ATMEGA16A-AUR Atmel, ATMEGA16A-AUR Datasheet - Page 203

• Manufacturer Part Number: ATMEGA16A-AUR
• Description: MCU AVR 16KB FLASH 16MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA16A-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (8K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

20.9.5
8154B–AVR–07/09
TWA R– TWI (Slave) Address Register
• Bits 7:0 – TWD: TWI Data Register
These eight bits contain the next data byte to be transmitted, or the latest data byte received on
the Two-wire Serial Bus.
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. 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 ($00). 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[6:0]: 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 Two-wire Serial Bus.
Bit
Read/Write
Initial Value
TWA6
R/W
7
1
TWA5
R/W
6
1
TWA4
R/W
5
1
TWA3
R/W
4
1
TWA2
R/W
3
1
TWA1
R/W
2
1
TWA0
R/W
1
1
ATmega16A
TWGCE
R/W
0
0
TWAR
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