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18.1 Overview
The H8/3048 has 128 kbytes of on-chip ROM, the H8/3047 has 96 kbytes, the H8/3045 has
64 kbytes and the H8/3044 has 32 kbytes. The ROM is connected to the CPU by a 16-bit data bus.
The CPU accesses both byte data and word data in two states, enabling rapid data transfer.
The mode pins (MD
table 18-1.
Table 18-1 Operating Mode and ROM
Mode
Mode 1 (1-Mbyte expanded mode with on-chip ROM disabled)
Mode 2 (1-Mbyte expanded mode with on-chip ROM disabled)
Mode 3 (16-Mbyte expanded mode with on-chip ROM disabled)
Mode 4 (16-Mbyte expanded mode with on-chip ROM disabled)
Mode 5 (1-Mbyte expanded mode with on-chip ROM enabled)
Mode 6 (16-Mbyte expanded mode with on-chip ROM enabled)
Mode 7 (single-chip mode)
The PROM version (H8/3048-ZTAT) and the flash memory version (H8/3048F-ZTAT) can be set
to PROM mode and programmed with a general-purpose PROM programmer.
Section 18 ROM
to MD
) can be set to enable or disable the on-chip ROM as indicated in
2
0
Mode Pins
MD
2
0
0
0
1
1
1
1
557
MD
MD
On-Chip ROM
1
0
Disabled
0
1
(external
1
0
address area)
1
1
0
0
0
1
Enabled
1
0
1
1
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