Rainbow-electronics ATtiny2313 Uživatelský manuál stáhnout pdf (Strana 54)

ATtiny2313

2543A–AVR–08/03

MCU Control Register –

MCUCR

• Bit 7 – 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 “Configuring the Pin” on page 48 for more details about this feature.

Alternate Functions of Port A The Port A pins with alternate functions are as shown in Table 5.

Alternate Functions of Port B The Port B pins with alternate functions are shown in Table 26.

The alternate pin configuration is as follows:

• USCK/SCL/PCINT7 - Port B, Bit 7

USCK: Three-wire mode Universal Serial Interface Clock.

SCL: Two-wire mode Serial Clock for USI Two-wire mode.

PCINT7: Pin Change Interrupt source 7. The PB7 pin can serve as an external interrupt

source.

• DO/PCINT6 - Port B, Bit 6

DO: Three-wire mode Universal Serial Interface Data output. Three-wire mode Data out-

put overrides PORTB6 value and it is driven to the port when data direction bit DDB6 is

set (one). However the PORTB6 bit still controls the pull-up enabling pull-up, if direction

is input and PORTB6 is set (one).

Bit 7 6 5 4 3 2 1 0

PUD

SM1 SE SM0 ISC11 ISC10 ISC01 ISC00 MCUCR

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

Table 25. Port A Pins Alternate Functions

Port Pin Alternate Function

PA2 RESET, dW

PA1 XTAL2

PA0 XTAL1

Table 26. Port B Pins Alternate Functions

Port Pin Alternate Functions

PB7 USCK/SCL/PCINT7

PB6 DO/PCINT6

PB5 DI/SDA/PCINT5

PB4 OC1B/PCINT4

PB3 OC1A/PCINT3

PB2 OC0A/PCINT2

PB1 AIN1/PCINT1

PB0 AIN0/PCINT0

1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 210 211

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Rainbow-electronics ATtiny2313 Uživatelský manuál Strana 54