ATmega325 Atmel Corporation, ATmega325 Datasheet - Page 81

• Manufacturer Part Number: ATmega325
• Manufacturer: Atmel Corporation

Specifications of ATmega325

• Flash (kbytes): 32 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: 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: 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

14.4
14.4.1
14.4.2
14.4.3
14.4.4
2570N–AVR–05/11
Register Description
MCUCR – MCU Control Register
PORTA – Port A Data Register
DDRA – Port A Data Direction Register
PINA – Port A Input Pins Address
Table 14-21. Overriding Signals for Alternate Functions in PH3:0
• Bit 4 – PUD: Pull-up Disable
When this bit is written to one, the pull-ups in the I/O ports are disabled even if the DDxn and
PORTxn Registers are configured to enable the pull-ups ({DDxn, PORTxn} = 0b01). See
figuring the Pin” on page 61
Bit
0x35 (0x55)
Read/Write
Initial Value
Bit
0x02 (0x22)
Read/Write
Initial Value
Bit
0x01 (0x21)
Read/Write
Initial Value
Bit
0x00 (0x20)
Read/Write
Initial Value
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
PTOE
DIEOE
DIEOV
DI
AIO
PORTA7
PINA7
DDA7
R/W
R/W
R/W
JTD
R/W
N/A
7
0
7
0
7
7
0
PJ3/PCINT27
0
0
0
0
0
0
–
PCINT27 •
PCIE0
0
–
–
PORTA6
PINA6
DDA6
R/W
R/W
R/W
N/A
6
0
6
0
6
R
6
–
0
for more details about this feature.
PORTA5
PINA5
DDA5
R/W
R/W
R/W
N/A
5
0
5
0
5
R
5
–
0
PJ2/PCINT26
0
0
0
0
0
0
–
PCINT26 •
PCIE0
0
–
–
PORTA4
PINA4
DDA4
R/W
R/W
R/W
N/A
4
0
4
0
4
PUD
R/W
4
0
ATmega325/3250/645/6450
PORTA3
PINA3
DDA3
R/W
R/W
R/W
N/A
3
0
3
0
3
R
3
–
0
PJ1/PCINT25
0
0
0
0
0
0
–
PCINT25 •
PCIE0
0
–
–
PORTA2
PINA2
DDA2
R/W
R/W
R/W
N/A
2
0
2
0
2
R
2
–
0
PORTA1
PINA1
DDA1
R/W
R/W
R/W
N/A
IVSEL
1
0
1
0
1
R/W
1
0
PJ0/PCINT24
0
0
0
0
0
0
–
PCINT24 •
PCIE0
0
–
–
PORTA0
PINA0
DDA0
R/W
R/W
R/W
N/A
IVCE
R/W
0
0
0
0
0
0
0
PORTA
MCUCR
DDRA
PINA
“Con-
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