attiny25v ATMEL Corporation, attiny25v Datasheet - Page 66

• Manufacturer Part Number: attiny25v
• Description: Microcontroller With 2/4/8k Bytes In-system Programmable Flash
• Manufacturer: ATMEL Corporation

10.4
10.4.1
10.4.2
10.4.3
10.4.4
66
Register Description
ATtiny25/45/85
MCUCR – MCU Control Register
PORTB – Port B Data Register
DDRB – Port B Data Direction Register
PINB – Port B Input Pins Address
• Bit 6 – 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 56
Bit
0x35
Read/Write
Initial Value
Bit
0x18
Read/Write
Initial Value
Bit
0x17
Read/Write
Initial Value
Bit
0x16
Read/Write
Initial Value
7
BODS
R
0
R
R
7
–
0
7
–
0
7
–
R
0
6
PUD
R/W
0
6
–
R
0
6
–
R
0
6
–
R
0
for more details about this feature.
5
PORTB5
R/W
0
5
DDB5
R/W
0
5
PINB5
R/W
N/A
5
SE
R/W
0
4
PORTB4
R/W
0
4
DDB4
R/W
0
4
PINB4
R/W
N/A
4
SM1
R/W
0
3
PORTB3
R/W
0
3
DDB3
R/W
0
3
PINB3
R/W
N/A
3
SM0
R/W
0
2
PORTB2
R/W
0
2
DDB2
R/W
0
2
PINB2
R/W
N/A
2
BODSE
R
0
1
PORTB1
R/W
0
1
DDB1
R/W
0
1
PINB1
R/W
N/A
1
ISC01
R/W
0
0
PORTB0
R/W
0
0
DDB0
R/W
0
0
R/W
N/A
PINB0
0
ISC00
R/W
0
2586K–AVR–01/08
MCUCR
PORTB
DDRB
PINB
“Con-