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15.1
Overview
The H8/3039 has 128 kbytes of on-chip ROM (flash memory or mask ROM), the H8/3038 has 64
kbytes, the H8/3037 has 32 kbytes and H8/3036 has 16 kbytes. The ROM is connected to the CPU
by a 16-bit data bus. The CPU accesses both byte and word data in two states, enabling rapid data
transfer.
The mode pins (MD
The on-chip flash memory product (H8/3039F-ZTAT) can be erased and programmed on-board as
well as with a general-purpose PROM programmer.
Table 15-1 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
(16-Mbyte expanded mode with on-chip ROM enabled)
Mode 6 (single-chip normal mode)
Mode 7 (single-chip advanced mode)
Note: * Modes 2 and 4 cannot be used with this LSI. Do not set the mode pin to mode 2 or 4.
Section 15 ROM
to MD
) can be set to enable or disable the on-chip ROM. See table 15-1.
2
0
Mode Pins
MD
MD
MD
2
1
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
On-Chip ROM
Disabled (external
address area)
Enabled
437
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