Z86C02 Datasheet, PDF (16/37 Pages) Zilog, Inc. – Two On-Board Comparators

Z86C02/E02/L02
Cost Effective, 512-Byte ROM CMOS Z8^® Microcontrollers
Zilog
PIN FUNCTIONS (Continued)
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 bi-directional, Schmitt-
triggered CMOS compatible I/O port. These three I/O lines
can be globally configured under software control to be in-
puts or outputs (Figure 8).
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
1.5
2.3 Hysteresis VCC @ 5.0V
In
R 500 kΩ
Figure 8. Port 0 Configuration
Auto Latch Option
16
PRELIMINARY
DS96DZ80301