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HD6432345 Datasheet, PDF (43/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual | |||
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2.1.3 Differences from H8/300 CPU
In comparison to the H8/300 CPU, the H8S/2000 CPU has the following enhancements.
⢠More general registers and control registers
 Eight 16-bit expanded registers, and one 8-bit control register, have been added.
⢠Expanded address space
 Normal mode supports the same 64-kbyte address space as the H8/300 CPU. (ZTAT, mask
ROM, and ROMless versions only)
 Advanced mode supports a maximum 16-Mbyte address space.
⢠Enhanced addressing
 The addressing modes have been enhanced to make effective use of the 16-Mbyte address
space.
⢠Enhanced instructions
 Addressing modes of bit-manipulation instructions have been enhanced.
 Signed multiply and divide instructions have been added.
 Two-bit shift instructions have been added.
 Instructions for saving and restoring multiple registers have been added.
 A test and set instruction has been added.
⢠Higher speed
 Basic instructions execute twice as fast.
2.1.4 Differences from H8/300H CPU
In comparison to the H8/300H CPU, the H8S/2000 CPU has the following enhancements.
⢠Additional control register
 One 8-bit control register has been added.
⢠Enhanced instructions
 Addressing modes of bit-manipulation instructions have been enhanced.
 Two-bit shift instructions have been added.
 Instructions for saving and restoring multiple registers have been added.
 A test and set instruction has been added.
⢠Higher speed
 Basic instructions execute twice as fast.
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