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ATtiny44 Datasheet(PDF) 67 Page - ATMEL Corporation

No. de pieza ATtiny44
Descripción Electrónicos  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  236 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny44 Datasheet(HTML) 67 Page - ATMEL Corporation

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67
8006H–AVR–10/09
ATtiny24/44/84
10.3
Register Description
10.3.1
MCUCR – MCU Control Register
• 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 “Con-
figuring the Pin” on page 55 for more details about this feature.
10.3.2
PORTA – Port A Data Register
10.3.3
DDRA – Port A Data Direction Register
Table 10-9.
Overriding Signals for Alternate Functions in PB1..PB0
Signal
Name
PB1/XTAL2/PCINT9
PB0/XTAL1/PCINT8
PUOE
EXT_OSC (1)
1.
EXT_OSC = crystal oscillator or low frequency crystal oscillator is selected as system clock.
EXT_CLOCK (2) + EXT_OSC(1)
2.
EXT_CLOCK = external clock is selected as system clock.
PUOV
0
0
DDOE
EXT_OSC(1)
EXT_CLOCK(2) + EXT_OSC(1)
DDOV
0
0
PVOE
EXT_OSC(1)
EXT_CLOCK(2) + EXT_OSC(1)
PVOV
0
0
PTOE
0
0
DIEOE
EXT_OSC (1)+
PCINT9 • PCIE1
EXT_CLOCK(2) + EXT_OSC(1) +
(PCINT8 • PCIE1)
DIEOV
EXT_OSC(1) • PCINT9 • PCIE1
( EXT_CLOCK(2) • PWR_DOWN ) +
(EXT_CLOCK(2) • EXT_OSC(1) • PCINT8 • PCIE1)
DI
PCINT9 Input
CLOCK/PCINT8 Input
AIO
XTAL2
XTAL1
Bit
7
6
5
4
3
2
1
0
BODS
PUD
SE
SM1
SM0
BODSE
ISC01
ISC00
MCUCR
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
RR
Initial Value
0
0
0
0
0
0
0
0
Bit
765
432
10
0x1B (0x3B)
PORTA7
PORTA6
PORTA5
PORTA4
PORTA3
PORTA2
PORTA1
PORTA0
PORTA
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0
Bit
7
6
543
210
0x1A (0x3A)
DDA7
DDA6
DDA5
DDA4
DDA3
DDA2
DDA1
DDA0
DDRB
Read/Write
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Initial Value
0
0
0
0
0
0
0
0



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