ATMEGA644A-MUR Atmel, ATMEGA644A-MUR Datasheet - Page 24
ATMEGA644A-MUR
Manufacturer Part Number
ATMEGA644A-MUR
Description
IC MCU AVR 64K FLASH 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-MUR
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
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
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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7.6
7.6.1
7.6.2
7.6.3
8272A–AVR–01/10
Register Description
EEARH and EEARL – The EEPROM Address Register
EEDR – The EEPROM Data Register
EECR – The EEPROM Control Register
• Bits 15:12 – Res: Reserved Bits
These bits are reserved bits in the ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
and will always read as zero.
• Bits 11:0 – EEAR8:0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL specify the EEPROM address in the
512/1K/2K/4K bytes EEPROM space. The EEPROM data bytes are addressed linearly between
0 and 511/1023/2047/4096. The initial value of EEAR is undefined. A proper value must be writ-
ten 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 7:6 – Res: Reserved Bits
These bits are reserved bits in the ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P
and will always read as zero.
• Bits 5:4 – EEPM1 and EEPM0: EEPROM Programming Mode Bits
The EEPROM Programming mode bit setting defines which programming action that will be trig-
gered when writing EEPE. It is possible to program data in one atomic operation (erase the old
value and program the new value) or to split the Erase and Write operations in two different
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Bit
0x22 (0x42)
0x21 (0x41)
Read/Write
Initial Value
Bit
0x20 (0x40)
Read/Write
Initial Value
Bit
0x1F (0x3F)
Read/Write
Initial Value
EEAR7
MSB
R/W
R/W
15
R
X
–
7
0
R
7
0
7
–
0
EEAR6
R/W
R/W
14
R
–
6
0
X
R
6
–
0
6
0
EEAR5
EEPM1
R/W
R/W
R/W
13
–
5
R
0
X
X
5
5
0
EEAR4
EEPM0
R/W
R/W
R/W
12
R
X
–
4
0
X
4
4
0
EEAR11
EEAR3
EERIE
R/W
R/W
R/W
R/W
11
X
X
3
3
0
3
0
EEAR10
EEMPE
EEAR2
R/W
R/W
R/W
R/W
10
2
0
X
X
2
0
2
EEAR9
EEAR1
EEPE
R/W
R/W
R/W
R/W
X
1
0
1
X
X
9
1
EEAR8
EEAR0
EERE
LSB
R/W
R/W
R/W
R/W
X
X
0
0
0
0
8
0
EEARH
EEARL
EEDR
EECR
24
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