Rainbow Electronics ATtiny26L - Manual (Page 5)

5
ATtiny26(L)
1477B–AVR–04/02
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
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. See page 77 for details on operating of the
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.