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H8S2245 Datasheet(PDF) 574 Page - Renesas Technology Corp

Part # H8S2245
Description  Renesas 16-Bit Single-Chip Microcomputer H8S Family / H8S/2200 Series
PDF  818 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

H8S2245 Datasheet(HTML) 574 Page - Renesas Technology Corp

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Section 16 ROM
Rev.3.00 Mar. 26, 2007 Page 532 of 772
REJ09B0355-0300
16.3
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 (MD
2, MD1, and MD0) and bit
EAE in BCRL. These settings are shown in table 16.2.
In the H8S/2246, H8S/2245, H8S/2244, and H8S/2243 normal mode, a maximum of 56 kbytes of
ROM can be used.
Table 16.2
Operating Modes and ROM Area
Mode Pin Setting
BCRL
On-Chip ROM
Operating Mode
MD
2
MD
1
MD
0
EAE
H8S/2246 and
H8S/2245
H8S/2244 and
H8S/2243
H8S/2242 and
H8S/2241
Mode 1
Normal expanded
mode with on-chip
ROM disabled
0
0
1
—
Disabled
Disabled
Disabled
Mode 2
Normal expanded
mode with on-chip
ROM enabled
10
—
Enabled
(56 kbytes)
Enabled
(56 kbytes)
Enabled
(32 kbytes)
Mode 3
Normal single-chip
mode
1
Mode 4
Advanced expanded
mode with on-chip
ROM disabled
1
0
0
—
Disabled
Disabled
Disabled
Mode 5
Advanced expanded
mode with on-chip
ROM disabled
1
Mode 6
1
0
0
Enabled
(128 kbytes)
Enabled
(64 kbytes)
Enabled
(32 kbytes)
Advanced expanded
mode with on-chip
ROM enabled
1
Enabled
(64 kbytes)
Mode 7
Advanced single-chip
mode
10
Enabled
(128 kbytes)
1
Enabled
(64 kbytes)
In H8S/2246 and H8S/2245 modes 6 and 7, the on-chip ROM available after a power-on reset is
the 64-kbyte area comprising addresses H'000000 to H'00FFFF.



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