ATMEGA649A-AU Atmel, ATMEGA649A-AU Datasheet - Page 27

• Manufacturer Part Number: ATMEGA649A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA649A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.6
7.6.1
7.6.2
8284A–AVR–10/10
Register Description
EEARH and EEARL – EEPROM Address Register ATmega169A/169PA
EEARH and EEARL – EEPROM Address Register
ATmega329A/329PA/3290A/3290PA/649A/649P/6490A/6490P
• Bits 15:9 – Reserved
These bits are reserved and will always be read as zero.
• Bits 8:0 – EEAR8:0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
511. The initial value of EEAR is undefined. A proper value must be written before the EEPROM
may be accessed.
• Bits 15:11 – Reserved
These bits are reserved bits in the
ATmega329A/329PA/3290A/3290PA/649A/649P/6490A/6490P and will always read as zero.
• Bits 10:0 – EEAR10:0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
1/2K bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0 and
1023/2047. The initial value of EEAR is undefined. A proper value must be written before the
EEPROM may be accessed.
Note:
Bit
0x22 (0x42)
0x21 (0x41)
Read/Write
Initial Value
Bit
0x22 (0x42)
0x21 (0x41)
Read/Write
Initial Value
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
1. EEAR10 is only valid for ATmega649A/649P/6490A/6490P.
EEAR7
EEAR7
R/W
R/W
15
R
0
X
–
7
15
R
X
–
7
0
EEAR6
EEAR6
R/W
14
R
X
R/W
–
6
0
14
R
X
–
6
0
EEAR5
R/W
EEAR5
13
R
X
–
5
0
R/W
13
R
X
–
5
0
EEAR4
R/W
12
R
–
4
0
X
EEAR4
R/W
12
R
X
–
4
0
EEAR3
R/W
11
R
X
–
3
0
EEAR3
R/W
11
R
–
3
0
X
EEAR10
EEAR2
R/W
R/W
10
X
X
2
EEAR2
R/W
(1)
10
R
X
–
2
0
EEAR9
EEAR1
R/W
R/W
9
1
X
X
EEAR1
R/W
R
X
9
–
1
0
EEAR8
EEAR0
R/W
R/W
EEAR8
EEAR0
8
0
X
X
R/W
R/W
X
X
8
0
EEARH
EEARL
EEARH
EEARL
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