ATtiny5 datasheet(41/168 Pages) ATMEL

No. de pieza	ATtiny5

Descripción Electrónicos	8-bit Microcontroller with 512/1024 Bytes In-System Programmable Flash

PDF	168 Pages

Scroll/Zoom	100%

Fabricante Electrónico	ATMEL [ATMEL Corporation]

Página de inicio	http://www.atmel.com

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41 / 168 page

8127C–AVR–10/09

ATtiny4/5/9/10

10.2 Ports as General Digital I/O

The ports are bi-directional I/O ports with optional internal pull-ups. Figure 10-2 shows a func-

tional description of one I/O-port pin, here generically called Pxn.

Figure 10-2. General Digital I/O(1)

Note:

1. WEx, WRx, WPx, WDx, REx, RRx, RPx, and RDx are common to all pins within the same port.

clkI/O, and SLEEP are common to all ports.

10.2.1

Configuring the Pin

Each port pin consists of four register bits: DDxn, PORTxn, PUExn, and PINxn. As shown in

“Register Description” on page 50, the DDxn bits are accessed at the DDRx I/O address, the

PORTxn bits at the PORTx I/O address, the PUExn bits at the PUEx I/O address, and the PINxn

bits at the PINx I/O address.

clk

RPx

RRx

RDx

WDx

WEx

SYNCHRONIZER

WDx:

WRITE DDRx

WRx:

WRITE PORTx

RRx:

READ PORTx REGISTER

RPx:

READ PORTx PIN

clk

I/O:

I/O CLOCK

RDx:

READ DDRx

WEx:

WRITE PUEx

REx:

READ PUEx

REx

RESET

CLR

PORTxn

CLR

DDxn

PINxn

SLEEP

SLEEP:

SLEEP CONTROL

Pxn

I/O

WPx

RESET

CLR

PUExn

WRx

WPx:

WRITE PINx REGISTER

ATtiny5 Datasheet(PDF) 41 Page - ATMEL Corporation

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