ATMEGA649A-AU Atmel, ATMEGA649A-AU Datasheet - Page 314

• Manufacturer Part Number: ATMEGA649A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA649A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• 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: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

27.2.1
27.3
27.4
27.5
8284A–AVR–10/10
Signature Bytes
Calibration Byte
Page Size
Latching of Fuses
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 ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P the signa-
ture bytes are given in
Table 27-6.
The ATmega169A/169PA/329A/329PA/3290A/3290PA/649A/649P/6490A/6490P 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 calibrated RC Oscillator.
Table 27-7.
Table 27-8.
Part
ATmega169A/169PA
ATmega329A/329PA
ATmega3290A/3290PA
ATmega649A/649P
ATmega6490A/6490P
ATmega169A/169PA/329A/329PA/649A/649P/3290A/3290PA/6490A/6490P
EEPROM Size
(32K bytes)
Flash Size
16K words
1K bytes
Device and JTAG ID
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
Table
Page Size
Page Size
64 words
4 bytes
0x000
0x1E
0x1E
0x1E
0x1E
0x1E
27-6.
Signature Bytes
PCWORD
PCWORD
0x001
EEA[1:0]
0x94
0x95
0x95
0x96
0x96
PC[5:0]
0x002
0x0B
0x0C
0x0B
0x0C
0x05
No. of Pages
No. of Pages
256
256
Part Number
950C
960C
950B
960B
9405
EEA[13:2]
PCPAGE
PC[13:6]
PCPAGE
JTAG
Manufacture ID
0x1F
0x1F
0x1F
0x1F
0x1F
EEAMSB
PCMSB
13
13
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