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H8/3021 Datasheet(PDF) 164 Page - Renesas Technology Corp

Part # H8/3021
Description  16-Bit Single-Chip Microcomputer
PDF  712 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8/3021 Datasheet(HTML) 164 Page - Renesas Technology Corp

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7. I/O Ports
Rev.2.00 Mar. 22, 2007 Page 140 of 684
REJ09B0352-0200
7.3.3
Pin Functions in Each Mode
The pin functions of port 2 differ between mode 1, 3 (expanded mode with on-chip ROM
disabled), modes 5 and 6 (expanded mode with on-chip ROM enabled), and mode 7 (single-chip
mode). The pin functions in each mode are described followings.
Modes 1 and 3: Address output can be selected for each pin in port 2. Figure 7.6 shows the pin
functions in modes 1 and 3.
Port 2
A
(output)
A
(output)
A
(output)
A
(output)
A
(output)
A
(output)
A (output)
A (output)
15
14
13
12
11
10
9
8
Figure 7.6 Pin Functions in Modes 1 and 3 (Port 2)
Modes 5 and 6: Address output or generic input can be selected for each pin in port 2. A pin
becomes an address output pin if the corresponding P2DDR bit is set to 1, and a generic input pin
if this bit is cleared to 0. Following a reset, all pins are input pins. To use a pin for address output,
its P2DDR bit must be set to 1. Figure 7.7 shows the pin functions in modes 5 and 6.



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