ATMEGA261 View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

ATMEGA261

8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash

Atmel Corporation 

2.2.6

2.2.7

Port B (PB7..PB0)

Port B is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The

Port B output buffers have symmetrical drive characteristics with both high sink and source

capability. As inputs, Port B pins that are externally pulled low will source current if the pull-up

resistors are activated. The Port B pins are tri-stated when a reset condition becomes active,

even if the clock is not running.

Port B also serves the functions of various special features of the ATtiny261/461/861 as listed

on page 63.

RESET

Reset input. A low level on this pin for longer than the minimum pulse length will generate a

reset, even if the clock is not running. The minimum pulse length is given in Table 23-3 on page

190. Shorter pulses are not guaranteed to generate a reset.

6 ATtiny261/ATtiny461/ATtiny861

7753E–AVR–06/10

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