Z86E30 Zilog., Z86E30 Datasheet - Page 28

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Z86E30

Manufacturer Part Number
Z86E30
Description
Z8 4K OTP Microcontroller
Manufacturer
Zilog.
Datasheet

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Z86E30/E31/E40
Z8 4K OTP Microcontroller
Port 2 (P27-P20). Port 2 is an 8-bit, bidirectional, CMOS-
compatible I/O port. These eight I/O lines can be config-
ured under software control as an input or output, indepen-
dently. All input buffers are Schmitt-triggered. Bits pro-
grammed as outputs can be globally programmed as
either push-pull or open-drain. Low EMI output buffers can
28
Open-Drain
OEN
Out
In
TTL Level Shifter
Z86E40
MCU
Figure 20. Port 2 Configuration
P R E L I M I N A R Y
R
500 K
be globally programmed by the software. When used as an
I/O port, Port 2 can be placed under handshake control.
In Handshake Mode, Port 3 lines P31 and P36 are used as
handshake control lines. The handshake direction is deter-
mined by the configuration (input or output) assigned to bit
7 of Port 2 (Figure 20).
Port 2 (I/O)
Handshake Controls
/DAV2 and RDY2
(P31 and P36)
Auto Latch
PAD
DS97Z8X0500
Zilog

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