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ATTINY24 Datasheet(PDF) 5 Page - ATMEL Corporation

Part No. ATTINY24
Description  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
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Maker  ATMEL [ATMEL Corporation]
Homepage  http://www.atmel.com
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ATTINY24 Datasheet(HTML) 5 Page - ATMEL Corporation

 
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5
8006FS–AVR–02/07
ATtiny24/44/84
2.2
Pin Descriptions
2.2.1
VCC
Supply voltage.
2.2.2
GND
Ground.
2.2.3
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 except PB3 which has the RESET capability. To use pin PB3 as an I/O pin, instead of
RESET pin, program (‘0’) RSTDISBL fuse. 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 ATtiny24/44/84 as listed on
Section 12.3 ”Alternate Port Functions” on page 61.
2.2.4
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 22-3 on page
183. Shorter pulses are not guaranteed to generate a reset.
2.2.5
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 an alternate functions as analog inputs for the ADC, analog comparator,
timer/counter, SPI and pin change interrupt as described in ”Alternate Port Functions” on page
61
3.
Resources
A comprehensive set of development tools, drivers and application notes, and datasheets are
available for download on http://www.atmel.com/avr.


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