ata6616 ATMEL Corporation, ata6616 Datasheet - Page 46

• Manufacturer Part Number: ata6616
• Description: Microcontroller With Lin Transceiver, 5v Regulator And Watchdog
• Manufacturer: ATMEL Corporation

4.4.5
4.4.5.1
4.4.5.2
4.4.5.3
46
ATA6616/ATA6617 [Preliminary]
Register Description
EEARH and EEARL – EEPROM Address Register
EEDR – EEPROM Data Register
EECR – EEPROM Control Register
• Bit 7:1 – Reserved Bits
These bits are reserved for future use and will always read as 0 in ATtiny167.
• Bits 8:0 – EEAR8:0: EEPROM Address
The EEPROM Address Registers – EEARH and EEARL – specifies the high EEPROM address
in the EEPROM space (see “E2 size” in
addressed linearly between 0 and “E2 size”. The initial value of EEAR is undefined. A proper
value must be written before the EEPROM may be accessed.
Note:
• 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.
• Bit 7,6 – Res: Reserved Bits
These bits are reserved for future use and will always read as 0 in ATtiny167. After reading,
mask out these bits. For compatibility with future AVR devices, always write these bits to zero.
• Bits 5, 4 – EEPM1 and EEPM0: EEPROM Programming Mode Bits
The EEPROM Programming mode bits 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 different modes are shown in
is set, any write to EEPMn will be ignored. During reset, the EEPMn bits will be reset to 0b00
unless the EEPROM is busy programming.
Bit
Bit
Read/Write
Read/Write
Initial Value
Initial Value
Bit
Read/Write
Initial Value
Bit
Read/Write
Initial Value
For information only - ATtiny47: EEAR8 exists as register bit but it is not used for addressing.
EEAR7
EEDR7
R/W
R/W
R
X
R
7
7
0
7
0
7
–
0
-
EEAR6
EEDR6
R/W
R/W
R
X
R
6
6
0
6
0
6
–
0
-
EEPM1
EEAR5
EEDR5
R/W
R/W
R/W
R
X
X
5
5
0
5
0
5
-
Table 4-2 on page
EEPM0
EEAR4
EEDR4
R/W
R/W
R/W
R
X
X
4
4
0
4
0
4
-
DRAFT
EEAR3
EEDR3
EERIE
R/W
R/W
R/W
R
X
3
3
0
3
0
3
0
-
EEMPE
EEAR2
EEDR2
39). The EEPROM data bytes are
R/W
R/W
R/W
R
2
2
0
X
2
0
2
0
-
EEAR1
EEDR1
EEPE
R/W
R/W
R/W
R
1
1
0
X
1
0
1
X
-
Table
EEAR8
EEAR0
EEDR0
EERE
4-3. While EEPE
R/W
R/W
R/W
R/W
X
X
0
0
0
0
0
0
9132A–AUTO–10/08
EEDR
EECR
EEARH
EEARL