5

ATtiny26(L)

1477ES–AVR–12/03

Pin Descriptions

VCC

Digital supply voltage pin.

GND

Digital ground pin.

AVCC

AVCC is the supply voltage pin for Port A and the A/D Converter (ADC). It should be

externally connected to V

connected to V

ADC.

Port A (PA7..PA0)

Port A is an 8-bit general purpose I/O port. PA7..PA0 are all I/O pins that can provide

internal pull-ups (selected for each bit). Port A has alternate functions as analog inputs

for the ADC and analog comparator and pin change interrupt as described in “Alternate

Port Functions” on page 95.

Port B (PB7..PB0)

Port B is an 8-bit general purpose I/O port. PB6..0 are all I/O pins that can provide inter-

nal pull-ups (selected for each bit). PB7 is an I/O pin if not used as the reset. To use pin

PB7 as an I/O pin, instead of RESET pin, program (“0”) RSTDISBL Fuse. Port B has

alternate functions for the ADC, clocking, timer counters, USI, SPI programming, and

pin change interrupt as described in “Alternate Port Functions” on page 95.

An External Reset is generated by a low level on the PB7/RESET pin. Reset pulses

longer than 50 ns will generate a reset, even if the clock is not running. 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.