Rainbow-electronics ATtiny861_V Manual de usuario descargar pdf (Pagina 68)

2588B–AVR–11/06

ATtiny261/461/861

12.4 Register Description

12.4.1 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 54 for more details about this feature.

12.4.2 PORTA – Port A Data Register

12.4.3 DDRA – Port A Data Direction Register

12.4.4 PINA – Port A Input Pins Address

12.4.5 PORTB – Port B Data Register

12.4.6 DDRB – Port B Data Direction Register

12.4.7 PINB – Port B Input Pins Address

Bit 7 6 5 4 3 2 1 0

0x35 (0x55)

-PUDSE SM1 SM0 - ISC01 ISC00 MCUCR

Read/Write R R/W R/W R/W R/W R R R

Initial Value 0 0 0 0 0 0 0 0

Bit 76543210

0x1B (0x3B) PORTA7 PORTA6 PORTA5 PORTA4 PORTA3 PORTA2 PORTA1 PORTA0 PORTA