Section 2 CPU
Rev. 3.00 Mar. 14, 2006 Page 27 of 804
REJ09B0104-0300
2.3 Instruction
Fetch
The H8SX CPU has two modes for instruction fetch: 16-bit and 32-bit modes. It is recommended
that the mode be set according to the bus width of the memory in which a program is stored. The
instruction-fetch mode setting does not affect operation other than instruction fetch such as data
accesses.
Note: In the H8SX/1520 Group, an instruction is fetched in 32-bit mode.
2.4 Address
Space
Figure 2.8 shows a memory map of the H8SX CPU. The address space differs depending on the
CPU operating mode.
H'0000
H'000000
H'007FFF
H'FF8000
H'FFFFFF
H'00000000
H'00FFFFFF
H'FFFFFFFF
H'00000000
H'FFFFFFFF
H'FFFF
Normal mode
Program area
Data area
(64 kbytes)
Program area
Data area
(4 Gbytes)
Program area
(16 Mbytes)
Program area
(16 Mbytes)
Data area
(64 kbytes)
Data area
(4 Gbytes)
Middle mode
Advanced mode
Maximum mode
Figure 2.8 Memory Map
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Содержание H8SX series
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