Z89135 Zilog., Z89135 Datasheet - Page 27
![no-image](/images/no-image-200.jpg)
Z89135
Manufacturer Part Number
Z89135
Description
Low-Cost DTAD Controller
Manufacturer
Zilog.
Datasheet
1.Z89135.pdf
(66 pages)
- Current page: 27 of 66
- Download datasheet (329Kb)
Zilog
Port 5. (P57-P50). Port 5 is an 8-bit, bidirectional, CMOS-
compatible I/O port (Figure 15). These eight I/O lines are
configured under software control as an input or output, in-
dependently. Port 5 is always available for I/O operation.
The input buffers are Schmitt-triggered. Bits programmed
as outputs may be globally programmed as either push-
pull or open-drain.
DS97TAD0300
Open-Drain
OEN
Out
In
1.5
Z89135/136
2.3V Hysteresis
Figure 15. Port 5 Configuration
MCU
P R E L I M I N A R Y
R = 500 K
Port 5 is a bit programmable general-purpose I/O port. The
control registers for Port 5 are mapped into the expanded
register file (Bank F) of the Z8.
Auto Latch. The Auto Latch on Port 5 puts valid CMOS
levels on all CMOS inputs which are not externally driven.
Whether this level is 0 or 1, cannot be determined. A valid
CMOS level, rather than a floating node, reduces exces-
sive supply current flow in the input buffer.
Port 5
(I/O)
Low-Cost DTAD Controller
Auto Latch
Z89135/136 (ROMless)
PAD
1-27
1
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