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Section 14 RAM
14.1 Overview
The H8/3022 has 8 kbytes of on-chip static RAM, H8/3021 has 8 kbytes, and H8/3020 has
4kbytes. 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 suitable for rapid data transfer.
The RAM enable bit (RAME) in the system control register (SYSCR) can enable or disable the
on-chip RAM.
Table 14-1 shows the address of the on-chip RAM in each operating mode.
Table 14-1 The Address of the On-Chip RAM in Each Operating Mode
Mode
H8/3022
(8 kbytes)
H8/3021
(8 kbytes)
H8/3020
(4k byte)
Modes 1, 5, 6, 7
H'FDF10 to H'FFF0F
H'FDF10 to H'FFF0F
H'FEF10 to H'FFF0F
Mode 3
H'FFDF10 to H'FFFF0F
H'FFDF10 to H'FFFF0F
H'FFEF10 to H'FFFF0F