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How should the instruction of FETCHMD bit of the SYSCR be used?

Latest Updated:03/26/2009

Question:

How should the instruction fetch mode select bit (FETCHMD bit) of the system control register (SYSCR) be used?

Answer:

Please set according to the bus width of the program storage memory. For example, when programming to internal ROM/RAM, 32-bit mode is appropriate, due to the 32-bit bus width. When programming to the external area, 16-bit mode is appropriate for both 8-bit access area and 16-bit access area.
When there are several different bus widths, please select the most appropriate mode.
Suitable Products
H8SX/1600
H8SX/1663
H8SX/1657
H8SX/1653
H8SX/1650, H8SX/1651
H8SX/1648A, H8SX/1648L
H8SX/1638, H8SX/1638L
H8SX/1622
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