ATMEGA169P-15AT View Datasheet(PDF) - Atmel Corporation
Part Name
Description
Manufacturer
ATMEGA169P-15AT Datasheet PDF : 373 Pages
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2.3 Pin Descriptions
2.3.1 VCC
2.3.2 GND
Digital supply voltage.
2.3.3
Ground.
Port A (PA7:PA0)
2.3.4
Port A is 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 ATmega169P as listed on
”Alternate Functions of Port A” on page 73.
Port B (PB7:PB0)
2.3.5
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 has better driving capabilities than the other ports.
Port B also serves the functions of various special features of the ATmega169P as listed on
”Alternate Functions of Port B” on page 74.
Port C (PC7:PC0)
2.3.6
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 special features of the ATmega169P as listed on ”Alternate
Functions of Port C” on page 77.
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 ATmega169P as listed on
”Alternate Functions of Port D” on page 79.
6 ATmega169P Automotive
7735B–AVR–12/07
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