Z8917629ASC 查看數據表（PDF） - Zilog

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Z8917629ASC

VOICE PROCESSING CONTROLLERS

Zilog 

Zilog

Z89175/Z89176

Voice Processing Controllers

Port 5 (P53-P50). Port 5 is a 4-bit, bidirectional, CMOS Port 5 is a bit programmable general-purpose I/O port. The

compatible I/O port (Figure 16). These four I/O lines are control registers for Port 5 are mapped into the expanded

configured under software control independently as inputs register file (Bank F) of the Z8.

or outputs. Port 5 is always available for I/O operation. The

2

input buffers are Schmitt-triggered. Bits programmed as Auto Latch. The Auto Latch on Port 5 puts valid CMOS

outputs can be globally programmed as either push-pull or levels on all CMOS inputs which are not externally driven.

open-drain.

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.

Z89175/176

MCU

Port 5

(I/O)

Open-Drain

OEN

Out

1.5

2.3V Hysteresis

In

R = 500 KΩ

Figure 16. Port 5 Configuration

Pad

Auto Latch

DS97TAD0100

PRELIMINARY

29

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