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HD6432351 Datasheet(PDF) 710 Page - Renesas Technology Corp

Part # HD6432351
Description  16-Bit Single-Chip Microcomputer
PDF  1025 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD6432351 Datasheet(HTML) 710 Page - Renesas Technology Corp

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Section 18 ROM (H8S/2351 Only)
Rev. 3.00 Sep 15, 2006 page 676 of 988
REJ09B0330-0300
18.2
Operation
The on-chip ROM is connected to the CPU by a 16-bit data bus, and both byte and word data can
be accessed in one state. Even addresses are connected to the upper 8 bits, and odd addresses to
the lower 8 bits. Word data must start at an even address.
The on-chip ROM is enabled and disabled by setting the mode pins (MD2, MD1, and MD0). These
settings are shown in table 18.1.
In normal mode, a maximum of 56 kbytes of ROM can be used.
Table 18.1 Operating Modes and ROM Area
Mode Pin
Operating Mode
MD2
MD1
MD0
On-Chip ROM
Mode 1
Normal expanded mode with
on-chip ROM disabled
0
0
1
Disabled
Mode 2
Normal expanded mode with
on-chip ROM enabled
1
0
Enabled (56 kbytes)
Mode 3
Normal single-chip mode
1
Mode 4
Advanced expanded mode
with on-chip ROM disabled
1
0
0
Disabled
Mode 5
Advanced expanded mode
with on-chip ROM disabled
1
Mode 6
Advanced expanded mode
with on-chip ROM enabled
1
0
Enabled
Mode 7
Advanced single-chip mode
1



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