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Z86C21 데이터시트(PDF) 9 Page - Zilog, Inc.

부품명 Z86C21
상세설명  8K ROM Z8 CMOS MICROCONTROLLER
PDF  35 Pages
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제조업체  ZILOG [Zilog, Inc.]
홈페이지  http://www.zilog.com
Logo ZILOG - Zilog, Inc.

Z86C21 데이터시트(HTML) 9 Page - Zilog, Inc.

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9
Z86C21 MCU
WITH
8K ROM
Port 2 (P27-P20). Port 2 is an 8-bit, bit programmable,
bidirectional, CMOS compatible port. Each of these eight
I/O lines can be independently programmed as an input or
output or globally as an open-drain output. Port 2 is always
available for I/O operation. When used as an I/O port,
Port 2 may be placed under handshake control. In this
configuration, Port 3 lines P31 and P36 are used as the
handshake control lines /DAV2 and RDY2. The handshake
signal assignment for Port 3 lines P31 and P36 is dictated
by the direction (input or output) assigned to P27
(Figure 7).
OEN
Out
In
PAD
Port 2 (I/O)
Handshake Controls
/DAV2 and RDY2
(P31 and P36)
Z86C21
MCU
TTL Level Shifter
Auto Latch
R
≈ 500 KΩ
Open-Drain
Figure 7. Port 2 Configuration



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