Z08617 Datasheet, PDF (7/26 Pages) Zilog, Inc. – NMOS Z8 8-BIT MCU KEYBOARD CONTROLLER

PIN FUNCTIONS (Continued)
Port 1 (P17-P10). Port 1 is an 8-bit, byte programmable,
bidirectional, NMOS compatible I/O port. These eight I/O
lines are configured under software control program as a
Z08617 NMOS Z8^® 8-BIT MCU
KEYBOARD CONTROLLER
byte input port or as an open-drain output port. When used
as an I/O port, inputs are standard NMOS (Figure 6).
Z8615
8
Port 1
I/O
(Open-Drain Output)
Input
Pad
OEN
Output
Figure 6. Port 1 Configuration
7