Rainbow Electronics ATtiny861_V - Manual (Page 5)

5
2588B–AVR–11/06
ATtiny261/461/861
2.2.6 Port B (PB7..PB0)
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 also serves the functions of various special features of the ATtiny261/461/861 as listed
on
page 61 .
2.2.7 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 23-3 on page
189 . Shorter pulses are not guaranteed to generate a reset.