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ATmega1284 Datasheet

8-bit Atmel Microcontroller

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ATmega1284 datasheet pdf
8.6 Register Description
8.6.1 EEARH and EEARL – The EEPROM Address Register
Bit
0x22 (0x42)
0x21 (0x41)
Read/Write
Initial Value
15
EEAR7
7
R
R/W
0
X
14
EEAR6
6
R
R/W
0
X
13
EEAR5
5
R
R/W
0
X
12
EEAR4
4
R
R/W
0
X
11
EEAR11
EEAR3
3
R/W
R/W
X
X
10
EEAR10
EEAR2
2
R/W
R/W
X
X
9
EEAR9
EEAR1
1
R/W
R/W
X
X
8
EEAR8
EEAR0
0
R/W
R/W
X
X
EEARH
EEARL
• Bits 15:12 – Reserved
These bits are reserved bits in the Atmel
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/4Kbytes 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 written before the
EEPROM may be accessed.
8.6.2 EEDR – The EEPROM Data Register
Bit
0x20 (0x40)
Read/Write
Initial Value
7
MSB
R/W
0
6
R/W
0
5
R/W
0
4
R/W
0
3
R/W
0
2
R/W
0
1
R/W
0
0
LSB
R/W
0
EEDR
• 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.
8.6.3 EECR – The EEPROM Control Register
Bit 7 6 5 4
0x1F (0x3F)
– EEPM1 EEPM0
Read/Write
R
R
R/W
R/W
Initial Value 0 0 X X
3
EERIE
R/W
0
2
EEMPE
R/W
0
1
EEPE
R/W
X
0
EERE
R/W
0
EECR
• Bits 7:6 – Reserved
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 triggered 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 operations. The Programming times for the
ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P [DATASHEET]
Atmel-8272G-AVR-01/2015
24
ATMEL Corporation
ATMEL Corporation



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