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ATMEGA164-20PU Datasheet(PDF) 6 Page - ATMEL Corporation

Part # ATMEGA164-20PU
Description  8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATMEGA164-20PU Datasheet(HTML) 6 Page - ATMEL Corporation

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6
ATmega164/324/644
2593AS–AVR–06/05
Pin Descriptions
VCC
Digital supply voltage.
GND
Ground.
Port A (PA7..PA0)
Port A serves as analog inputs to the Analog-to-digital Converter.
Port A also serves as an 8-bit bi-directional I/O port with internal pull-up resistors
(selected for each bit). The Port A output buffers have symmetrical drive characteristics
with both high sink and source capability. As inputs, Port A pins that are externally
pulled low will source current if the pull-up resistors are activated. The Port A pins are
tri-stated when a reset condition becomes active, even if the clock is not running.
Port A also serves the functions of various special features of the ATmega164/324/644
as listed on page 71.
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 ATmega164/324/644
as listed on page 73.
Port C (PC7..PC0)
Port C is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each
bit). The Port C output buffers have symmetrical drive characteristics with both high sink
and source capability. As inputs, Port C pins that are externally pulled low will source
current if the pull-up resistors are activated. The Port C pins are tri-stated when a reset
condition becomes active, even if the clock is not running.
Port C also serves the functions of the JTAG interface, along with special features of the
ATmega164/324/644 as listed on page 76.
Port D (PD7..PD0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each
bit). The Port D output buffers have symmetrical drive characteristics with both high sink
and source capability. As inputs, Port D pins that are externally pulled low will source
current if the pull-up resistors are activated. The Port D pins are tri-stated when a reset
condition becomes active, even if the clock is not running.
Port D also serves the functions of various special features of the ATmega164/324/644
as listed on page 78.
RESET
Reset input. A low level on this pin for longer than the minimum pulse length will gener-
ate a reset, even if the clock is not running. The minimum pulse length is given in Table
20 on page 44. Shorter pulses are not guaranteed to generate a reset.
XTAL1
Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
XTAL2
Output from the inverting Oscillator amplifier.
AVCC
AVCC is the supply voltage pin for Port F and the Analog-to-digital Converter. It should
be externally connected to V
CC, even if the ADC is not used. If the ADC is used, it should
be connected to V
CC through a low-pass filter.


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