ATMEGA644PV-20AU Atmel, ATMEGA644PV-20AU Datasheet - Page 296
![IC MCU AVR 64K FLASH 44-TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644PV-20AU
Manufacturer Part Number
ATMEGA644PV-20AU
Description
IC MCU AVR 64K FLASH 44-TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PV-20AU
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-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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Company
Part Number
Manufacturer
Quantity
Price
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24.2.1
24.3
24.4
24.5
Table 24-7.
Table 24-8.
8011O–AVR–07/10
ATmega164P
ATmega324P
ATmega644P
ATmega164P
ATmega324P
ATmega644P
Device
Device
Signature Bytes
Calibration Byte
Page Size
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
512 bytes
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 24-6.
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.
1 Kbytes
2 Kbytes
Part
ATmega164P
ATmega324P
ATmega644P
Table
Device and JTAG ID
24-6.
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
0x08
0x0A
ATmega164P/324P/644P
No. of Pages
No. of Pages
128
256
256
128
256
256
Part Number
940A
960A
9508
EEA[10:3]
PCPAGE
PCPAGE
PC[12:6]
EEA[8:2]
EEA[9:2]
PC[13:6]
PC[14:7]
JTAG
Manufacture ID
0x1F
0x1F
0x1F
EEAMSB
PCMSB
10
12
13
14
8
9
296
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