ATmega64A Atmel Corporation, ATmega64A Datasheet - Page 307

• Manufacturer Part Number: ATmega64A
• Manufacturer: Atmel Corporation

Specifications of ATmega64A

• Flash (kbytes): 64 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 8
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Uart: 2
• 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): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 8
• Input Capture Channels: 2
• Pwm Channels: 7
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

27.6.13
27.6.14
27.6.15
8160C–AVR–07/09
Reading the Signature Bytes
Reading the Calibration Byte
Parallel Programming Characteristics
Figure 27-6. Mapping Between BS1, BS2 and the Fuse and Lock Bits during Read
The algorithm for reading the Signature bytes is as follows (refer to “Programming the Flash” for
details on Command and Address loading):
1. A: Load Command “0000 1000”.
2. B: Load Address Low Byte (0x00 - 0x02).
3. Set OE to “0”, and BS1 to “0”. The selected Signature byte can now be read at DATA.
4. Set OE to “1”.
The algorithm for reading the Calibration bytes is as follows (refer to “Programming the Flash”
for details on Command and Address loading):
1. A: Load Command “0000 1000”.
2. B: Load Address Low Byte, (0x00 - 0x03).
3. Set OE to “0”, and BS1 to “1”. The Calibration byte can now be read at DATA.
4. Set OE to “1”.
Figure 27-7. Parallel Programming Timing, Including some General Timing Requirements
(DATA, XA0/1, BS1, BS2)
Data & Contol
RDY/BSY
PAGEL
XTAL1
Fuse Low Byte
Extended Fuse Byte
Lock Bits
Fuse High Byte
WR
t
t
BVPH
DVXH
BS2
BS2
t
t
XHXL
PHPL
t
t
t
t
XLDX
XLWL
PLBX
PLWL
0
1
0
1
t
BVWL
BS1
t
WL WH
WLRL
0
1
t
DATA
WLBX
ATmega64A
t
WLRH
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