ATMEGA128A-ANR Atmel, ATMEGA128A-ANR Datasheet - Page 30

• Manufacturer Part Number: ATMEGA128A-ANR
• Description: IC MCU AVR 128K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA128A-ANR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: EBI/EMI, I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 53
• Program Memory Size: 128KB (64K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 4K 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: 64-TQFP
• Core: AVR8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.6
7.6.1
7.6.2
7.6.3
8151H–AVR–02/11
Register Description
EEARH and EEARL - EEPROM Address Register
EEDR - EEPROM Data Register
EECR - EEPROM Control Register
• Bits 15:12 – Reserved
These are reserved bits and will always read as zero. When writing to this address location,
write these bits to zero for compatibility with future devices.
• Bits 11:0 – EEAR[11:0]: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL – specify the EEPROM address in the 4
Kbytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and 4096.
The initial value of EEAR is undefined. A proper value must be written before the EEPROM may
be accessed.
• Bits 7:0 – EEDR7:0: EEPROM Data
For the EEPROM write operation, the EEDR Register contains the data to be written to the
EEPROM in the address given by the EEAR Register. For the EEPROM read operation, the
EEDR contains the data read out from the EEPROM at the address given by EEAR.
• Bits 7:4 – Reserved
These bits are reserved bits in the ATmega128A and will always read as zero.
• Bit 3 – EERIE: EEPROM Ready Interrupt Enable
Writing EERIE to one enables the EEPROM Ready Interrupt if the I-bit in SREG is set. Writing
EERIE to zero disables the interrupt. The EEPROM Ready interrupt generates a constant inter-
rupt when EEWE is cleared.
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
EEAR7
MSB
R/W
R/W
15
R
X
R
–
7
0
7
0
7
–
0
EEAR6
R/W
R/W
14
R
X
–
6
0
R
6
0
6
–
0
EEAR5
R/W
R/W
13
R
X
–
5
0
R
5
0
5
–
0
EEAR4
R/W
R/W
12
–
4
R
0
X
R
4
–
0
4
0
EEAR11
EEAR3
EERIE
R/W
R/W
R/W
R/W
11
3
X
X
3
0
3
0
EEAR10
EEMWE
EEAR2
R/W
R/W
R/W
R/W
10
X
X
2
0
2
0
2
EEAR9
EEAR1
EEWE
ATmega128A
R/W
R/W
R/W
R/W
1
0
X
1
X
X
9
1
EEAR8
EEAR0
EERE
LSB
R/W
R/W
R/W
R/W
0
0
0
0
8
0
X
X
EEARH
EEARL
EEDR
EECR
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