Datasheet

4
8008HS–AVR–04/11
ATtiny48/88
minimum pulse length is given in Table 22-3 on page 209. Shorter pulses are not guaranteed to
generate a reset.
The various special features of Port C are elaborated in “Alternate Functions of Port C” on page
72.
1.1.8 Port D (PD7:0)
Port D is an 8-bit bi-directional I/O port with internal pull-up resistors (selected for each bit). The
PD[7:4] output buffers have symmetrical drive characteristics with both sink and source capabil-
ities, while the PD[3:0] output buffers have high sink capabilities. As inputs, Port D pins that are
externally pulled low will source current if the pull-up resistors are activated. The Port D pins are
tri-stated when a reset condition becomes active, even if the clock is not running.
The various special features of Port D are elaborated in “Alternate Functions of Port D” on page
75.