ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 294

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

25.2.1
25.3
25.4
25.5
Table 25-7.
Table 25-8.
294
ATmega164P
ATmega324P
ATmega644P
ATmega164P
ATmega324P
ATmega644P
Device
Device
Signature Bytes
Calibration Byte
Page Size
ATmega164P/324P/644P
Latching of Fuses
No. of Words in a Page and No. of Pages in the Flash
No. of Words in a Page and No. of Pages in the EEPROM
8K words (16 Kbytes)
16K words (32 Kbytes)
32K words (64 Kbytes)
EEPROM Size
Flash Size
The fuse values are latched when the device enters programming mode and changes of the
fuse values will have no effect until the part leaves Programming mode. This does not apply to
the EESAVE Fuse which will take effect once it is programmed. The fuses are also latched on
Power-up in Normal mode.
All Atmel microcontrollers have a three-byte signature code which identifies the device. This
code can be read in both serial and parallel mode, also when the device is locked. The three
bytes reside in a separate address space. For the ATmega164P/324P/644P the signature bytes
are given in
Table 25-6.
The ATmega164P/324P/644P has a byte calibration value for the internal RC Oscillator. This
byte resides in the high byte of address 0x000 in the signature address space. During reset, this
byte is automatically written into the OSCCAL Register to ensure correct frequency of the cali-
brated RC Oscillator.
512 bytes
1 Kbytes
2 Kbytes
Part
ATmega164P
ATmega324P
ATmega644P
Table
Device and JTAG ID
25-6.
Page Size
128 words
Page Size
64 words
64 words
0x000
4 bytes
4 bytes
8 bytes
0x1E
0x1E
0x1E
Signature Bytes Address
0x001
0x94
0x95
0x96
PCWORD
PCWORD
EEA[1:0]
EEA[1:0]
EEA[2:0]
PC[5:0]
PC[5:0]
PC[6:0]
0x002
0x0A
0x0A
0x08
No. of Pages
No. of Pages
128
256
256
128
256
256
Part Number
940A
960A
9508
EEA[10:3]
PCPAGE
PCPAGE
EEA[8:2]
EEA[9:2]
PC[12:6]
PC[13:6]
PC[14:7]
JTAG
Manufacture ID
0x1F
0x1F
0x1F
8011D–AVR–02/07
EEAMSB
PCMSB
10
12
13
14
8
9