ATTINY40 Ver la hoja de datos (PDF) - Atmel Corporation
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ATTINY40 Datasheet PDF : 216 Pages
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ATtiny40
1.1.4
1.1.5
1.1.6
Port A (PA7:PA0)
Port A is a 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 has alternate functions as analog inputs for the ADC, analog comparator and pin change
interrupt as described in “Alternate Port Functions” on page 52.
Port B (PB3:PB0)
Port B is a 4-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.
The port also serves the functions of various special features of the ATtiny40, as listed on page
41.
Port C (PC5:PC0)
Port C is a 6-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 except PC3 which has the RESET capability. To use pin PC3 as an I/O pin, instead of
RESET pin, program (‘0’) RSTDISBL fuse. 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 has alternate functions as analog inputs for the ADC, analog comparator and pin change
interrupt as described in “Alternate Port Functions” on page 52.
The port also serves the functions of various special features of the ATtiny40, as listed on page
41.
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8263A–AVR–08/10
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