Z8939320FSC View Datasheet(PDF) - Zilog

Part Name

Description

Manufacturer

Z8939320FSC

16-BITDIGITAL SIGNALPROCESSORS

Zilog 

PRELIMINARY

16-bit Programmable I/O (Port 0)

Z89323/373/393

16-BIT DIGITAL SIGNAL PROCESSORS

When the appropriate bit is set in the Port 1 control register,

Port 0 acts as a 16-bit programmable, bidirectional, CMOS-

compatible port. Each of the 16 lines can be independently

programmed as an input or an output, or globally as an

open-drain output. When enabled, Bank 0/Ext 4 acts as the

data I/O register. Bank 15/Ext 0 serves as the Port 0

direction register while Bank 15/Ext 1, has specified bits to

enable Port 0 and determine whether Port 0 is globally

configured as open-drain outputs.

Bank 15/Ext 0 Reg

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Port I/O Direction

0 = Output

1 = Input

Figure 19. Port 0 Control Register

Open-Drain

OEN

Pad

Out

In

R ≈ 500 kOhms

Auto Latch

Figure 20. Port 0, 1 and 2 Configuration

DS95DSP0101 Q4/95

29

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