Operation - Renesas H8S Series Hardware Manual

19.3

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
settings are shown in tables 19-2 and 19-3.
Table 19-2 Operating Modes and ROM Area (H8S/2357 F-ZTAT)
Operating Mode
Mode 0 —
Mode 1
Mode 2
Mode 3
Mode 4 Advanced expanded mode
with on-chip ROM disabled
Mode 5 Advanced expanded mode
with on-chip ROM disabled
Mode 6 Advanced expanded mode
with on-chip ROM enabled
Mode 7 Advanced single-chip mode
Mode 8 —
Mode 9
Mode 10 Boot mode (advanced
expanded mode with on-
chip ROM enabled)*
Mode 11 Boot mode (advanced
single-chip mode)*
Mode 12 —
Mode 13
Mode 14 User program mode
(advanced expanded mode
with on-chip ROM
enabled)*
Mode 15 User program mode
(advanced single-chip
mode)*
Notes: 1. Note that in modes 6, 7, 14, and 15, the on-chip ROM that can be used after a power-on reset is the 64-kbyte
area from H'000000 to H'00FFFF.
2. Note that in the mode 10 and mode 11 boot modes, the on-chip ROM that can be used immediately after all
flash memory is erased by the boot program is the 64-kbyte area from H'000000 to H'00FFFF.
3. Apart from the fact that flash memory can be erased and programmed, operation is the same as in advanced
expanded mode with on-chip ROM enabled.
4. Apart from the fact that flash memory can be erased and programmed, operation is the same as in advanced
single-chip mode.
FWE MD
0
1
3
4
3
4
, MD , and MD
2 1
Mode Pin BCRL
MD MD EAE
2 1 0
0 0 0 —
1
1 0
1
1 0 0 —
1
1 0 0
1
1 0
1
0 0 0 —
1
1 0 0
1
1 0
1
1 0 0 —
1
1 0 0
1
1 0
1
) and bit EAE in BCRL. These
0
On-Chip ROM
—
Disabled
Enabled (128 kbytes)*
Enabled (64 kbytes)
Enabled (128 kbytes)*
Enabled (64 kbytes)
—
Enabled (128 kbytes)*
Enabled (64 kbytes)
Enabled (128 kbytes)*
Enabled (64 kbytes)
—
Enabled (128 kbytes)*
Enabled (64 kbytes)
Enabled (128 kbytes)*
Enabled (64 kbytes)
Rev.6.00 Oct.28.2004 page 565 of 1016
REJ09B0138-0600H
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