ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 70

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

12.4
12.4.1
12.4.2
70
Register Description
Atmel ATtiny24/44/84 [Preliminary]
MCUCR – MCU Control Register
PORTA – Port A Data Register
Table 12-9.
1.
2.
.
• Bit 6 – PUD: Pull-up Disable
When this bit is written to logical 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
Bit
Read/Write
Initial Value
Bit
0x1B (0x3B)
Read/Write
Initial Value
Signal
Name
PUOE
PUOV
DDOE
DDOV
PVOE
PVOV
PTOE
DIEOE
DIEOV
DI
AIO
“Configuring the Pin” on page 57
EXT_OSC = crystal oscillator or low frequency crystal oscillator is selected as system clock.
EXT_CLOCK = external clock is selected as system clock.
PB1/XTAL2/PCINT9
EXT_OSC
0
EXT_OSC
0
EXT_OSC
0
0
EXT_OSC
PCINT9 • PCIE1
EXT_OSC
PCINT9 Input
XTAL2
PORTA7
BODS
Overriding Signals for Alternate Functions in PB1..PB0
R/W
R/W
7
0
7
0
(1)
(1)
(1)
(1)
(1)
PORTA6
+
• PCINT9 • PCIE1
PUD
R/W
R/W
6
0
6
0
PORTA5
R/W
R/W
5
0
SE
5
0
for more details about this feature.
PORTA4
R/W
4
0
SM1
R/W
4
0
PB0/XTAL1/PCINT8
EXT_CLOCK
0
EXT_CLOCK
0
EXT_CLOCK
0
0
EXT_CLOCK
(PCINT8 • PCIE1)
(EXT_CLOCK
(EXT_CLOCK
CLOCK/PCINT8 Input
XTAL1
PORTA3
R/W
3
0
SM0
R/W
3
0
(2)
(2)
(2)
(2)
(2)
(2)
PORTA2
R/W
+ EXT_OSC
+ EXT_OSC
+ EXT_OSC
BODSE
+ EXT_OSC
• PWR_DOWN ) +
• EXT_OSC
2
0
R/W
2
0
PORTA1
R/W
ISC01
1
0
R
1
0
(1)
(1)
(1)
(1)
(1)
+
• PCINT8 • PCIE1)
PORTA0
ISC00
R/W
0
0
R
0
0
7701E–AVR–02/11
MCUCR
PORTA