ATTINY85-15MT1 View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
ATTINY85-15MT1 Datasheet PDF : 196 Pages
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5.3.2
EEPROM Address Register High – EEARH
Bit
7
6
5
4
3
2
1
0
-
-
-
-
-
-
-
EEAR8
EEARH
Read/Write
R
R
R
R
R
R
R
R/W
Initial Value
X
X
X
X
X
X
X
X
• Bit 7..1 – Res6..0: Reserved Bits
These bits are reserved for future use and will always read as 0 in ATtiny25/45/85.
• Bits 0 – EEAR8: EEPROM Address
The EEPROM Address Register – EEARH – specifies the high EEPROM address in the
128/256/512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0
and 127/255/511. The initial value of EEAR is undefined. A proper value must be written before
the EEPROM may be accessed.
5.3.3
5.3.4
5.3.5
EEPROM Address Register – EEARL
Bit
Read/Write
Initial Value
7
EEAR7
R
X
6
EEAR6
R
X
5
EEAR5
R/W
X
4
EEAR4
R/W
X
3
EEAR3
R/W
X
2
EEAR2
R/W
X
1
EEAR1
R/W
X
0
EEAR0
R/W
X
EEARL
• Bits 7..0 – EEAR7..0: EEPROM Address
The EEPROM Address Register – EEARL – specifies the low EEPROM address in the
128/256/512 bytes EEPROM space. The EEPROM data bytes are addressed linearly between 0
and 127/255/511. The initial value of EEAR is undefined. A proper value must be written before
the EEPROM may be accessed.
EEPROM Data Register – EEDR
Bit
Read/Write
Initial Value
7
EEDR7
R/W
X
6
EEDR6
R/W
X
5
EEDR5
R/W
X
4
EEDR4
R/W
X
3
EEDR3
R/W
X
2
EEDR2
R/W
X
1
EEDR1
R/W
X
0
EEDR0
R/W
X
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.
EEPROM Control Register – EECR
Bit
7
6
5
4
3
2
1
0
–
–
EEPM1 EEPM0
EERIE
EEMPE
EEPE
EERE
EECR
Read/Write
R
R
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
X
X
0
0
X
0
• Bit 7 – Res: Reserved Bit
This bit is reserved for future use and will always read as 0 in ATtiny25/45/85. For compatibility
with future AVR devices, always write this bit to zero. After reading, mask out this bit.
16 ATtiny25/45/85
7598H–AVR–07/09
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