atmega3250v-8auatmega325v-8ai ATMEL Corporation, atmega3250v-8auatmega325v-8ai Datasheet - Page 80

• Manufacturer Part Number: atmega3250v-8auatmega325v-8ai
• Description: Atmega3250 8-bit Microcontroller With In-system Programmable Flash
• Manufacturer: ATMEL Corporation

14.4
14.4.1
14.4.2
14.4.3
14.4.4
80
Register Description
ATmega325/3250/645/6450
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 60
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
JTD
R/W
R/W
R/W
R/W
N/A
7
0
7
0
7
0
7
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
5
–
R
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
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
2570L–AVR–08/07
“Con-