ATmega3250A Atmel Corporation, ATmega3250A Datasheet - Page 286

• Manufacturer Part Number: ATmega3250A
• Manufacturer: Atmel Corporation

Specifications of ATmega3250A

• Flash (kbytes): 32 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 69
• Ext Interrupts: 25
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 2
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 4
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

27.2.1
27.3
27.4
27.5
8285D–AVR–06/11
Signature Bytes
Calibration Byte
Page Size
Latching of Fuses
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
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. The signature bytes are given in
Table 27-6.
The ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P 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
ATmega165A
ATmega165PA
ATmega325A
ATmega325PA
ATmega3250A
ATmega3250PA
ATmega645A
ATmega645P
ATmega6450A
ATmega6450P
8K words (16Kbytes)
EEPROM Size
Flash Size
512bytes
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
0x000
0x1E
0x1E
0x1E
0x1E
0x1E
0x1E
0x1E
0x1E
0x1E
0x1E
Page Size
Page Size
64 words
4 bytes
Signature Bytes
0x001
0x94
0x94
0x95
0x95
0x95
0x95
0x96
0x96
0x96
0x96
PCWORD
PCWORD
EEA[1:0]
PC[5:0]
0x002
0x0D
0x0D
0x0E
0x0E
0x10
0x07
0x05
0x06
0x05
0x06
No. of Pages
No. of Pages
Part Number
128
128
950D
950D
950E
950E
960D
960D
960E
960E
9407
9407
PCPAGE
EEA[8:2]
PCPAGE
PC[12:6]
JTAG
Table
Manufacture ID
27-6.
0x1F
0x1F
0x1F
0x1F
0x1F
0x1F
0x1F
0x1F
0x1F
0x1F
EEAMSB
PCMSB
12
8
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