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16.1
Overview
The H8/3008 has high-speed static RAM on-chip. The RAM is connected to the CPU by a 16-bit
data bus. The CPU accesses both byte data and word data in two states, making the RAM useful
for rapid data transfer.
The on-chip RAM can be enabled or disabled with the RAM enable bit (RAME) in the system
control register (SYSCR). When the on-chip RAM is disabled, that area is assigned to external
space in the expanded modes. The on-chip RAM specifications for the H8/3008 are shown in table
16.1.
Table 16.1 H8/3008 On-Chip RAM Specifications
RAM size
Address assignment
Section 16 RAM
Modes 1, 2
Modes 3, 4
4 kbytes
H'FEF20 to H'FFF1F
H'FFEF20 to H'FFFF1F
425
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