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ATTINY25 Folha de dados(PDF) 5 Page - ATMEL Corporation

Nome de Peças ATTINY25
Descrição Electrónicos  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATTINY25 Folha de dados(HTML) 5 Page - ATMEL Corporation

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5
7598D–AVR–02/07
ATtiny25/45/85 Auto
2.3
Pin Descriptions
2.3.1
VCC
Supply voltage.
2.3.2
GND
Ground.
2.3.3
Port B (PB5..PB0)
Port B is a 6-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 ATtiny25/45/85 as listed on
page 54.
On the ATtiny25 device the programmable I/O ports PB3 and PB4 (pins 2 and 3) are exchanged
in the ATtiny15 compatibility mode for supporting the backward compatibility with ATtiny15.
2.3.4
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 8-1 on page
36. Shorter pulses are not guaranteed to generate a reset.
3.
About Code Examples
This documentation contains simple code examples that briefly show how to use various parts of
the device. These code examples assume that the part specific header file is included before
compilation. Be aware that not all C compiler vendors include bit definitions in the header files
and interrupt handling in C is compiler dependent. Please confirm with the C compiler documen-
tation for more details.
4.
AVR CPU Core
4.1
Introduction
This section discusses the AVR core architecture in general. The main function of the CPU core
is to ensure correct program execution. The CPU must therefore be able to access memories,
perform calculations, control peripherals, and handle interrupts.


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