ATmega325P Atmel Corporation, ATmega325P Datasheet - Page 276

• Manufacturer Part Number: ATmega325P
• Manufacturer: Atmel Corporation

Specifications of ATmega325P

• Flash (kbytes): 32 Kbytes
• Pin Count: 64
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 54
• Ext Interrupts: 17
• 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: Yes
• 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

25.6
25.6.1
276
Parallel Programming
ATmega325P/3250P
Enter Programming Mode
Table 25-9.
Table 25-10. Command Byte Bit Coding
Table 25-11. No. of Words in a Page and No. of Pages in the Flash
Table 25-12. No. of Words in a Page and No. of Pages in the EEPROM
The following algorithm puts the device in Parallel (High-voltage) Programming mode:
1. Set Prog_enable pins listed in
2. Apply 4.5 - 5.5V between V
3. Ensure that V
4. Wait 20 - 60 µs, and apply 11.5 - 12.5V to RESET.
XA1
0V.
EEPROM Size
0
0
1
1
(32K bytes)
Flash Size
16K words
Command Byte
1K bytes
1000 0000
0100 0000
0010 0000
0001 0000
0001 0001
0000 1000
0000 0100
0000 0010
0000 0011
XA1 and XA0 Coding
XA0
0
1
0
1
CC
reaches at least 1.8V within the next 20 µs.
Page Size
Page Size
64 words
Action when XTAL1 is Pulsed
Load Flash or EEPROM Address (High or low address byte determined by
BS1).
Load Data (High or Low data byte for Flash determined by BS1).
Load Command
No Action, Idle
4 bytes
Command Executed
Chip Erase
Write Fuse bits
Write Lock bits
Write Flash
Write EEPROM
Read Signature Bytes and Calibration byte
Read Fuse and Lock bits
Read Flash
Read EEPROM
CC
and GND.
Table 25-8 on page 275
PCWORD
PCWORD
EEA[1:0]
PC[5:0]
No. of Pages
No. of Pages
256
256
to “0000”, RESET pin and V
EEA[13:2]
PCPAGE
PC[13:6]
PCPAGE
8023F–AVR–07/09
EEAMSB
PCMSB
CC
13
13
to