Z86L04/L08
Z8 8-Bit Cost-Effective Microcontrollers
Zilog
PIN FUNCTIONS
XTAL1, XTAL2
Crystal In, Crystal Out (time-based input
and output, respectively). These pins connect a parallel-
resonant crystal, LC, RC, or an external single-phase
clock (8 MHz max) to the on-chip clock oscillator and buff-
er.
Port 0, P02-P00.
Port 0 is a 3-bit bidirectional, Schmitt-trig-
gered CMOS compatible I/O port. These three I/O lines
can be globally configured under software control to be in-
puts or outputs (Figure 7).
Auto Latch.
The Auto Latch puts valid CMOS levels on all
CMOS inputs (except P33, P32, P31) that are not external-
ly driven. A valid CMOS level, rather than a floating node,
reduces excessive supply current flow in the input buffer.
On Power-up and Reset, the Auto Latch will set the ports
to an undetermined state of 0 or 1. Default condition is
Auto Latches enabled.
Z8
Port 0 (I/O)
Open
PAD
Out
In
Auto Latch Option
R
500 kΩ
Figure 7. Port 0 Configuration
10
PRELIMINARY
DS97LVO0901
ZILOG [ ZILOG, INC. ]
