ZiLOG Z8 Series

Z8
®
CPU
User Manual
UM001604-0108 Input/Output Ports
49
Figure 33. Port 0 Handshake Operation
Figure 34. Port 1 Configuration with Open-Drain Capability, Autolatch, and
Schmitt-Trigger
D2
(Write-Only)
0 P32 = Input
P35 = Output
Port 3 Mode Register (P3M)
Register F7h
1 P32 = DAV0/RDY0
P35 = RDY0/DAV0
OEN
Port 1
(I/O or AD7–AD0)
Handshake Controls
DAV1
and RDY1
8
Z8
(P33 and P34)
PIN
OUT
IN
2.3 V Hysteresis
OPEN-DRAIN
1.5
R ≈ 500 K Ω
Autolatch