H8SX1663 datasheet(75/1158 Pages) RENESAS

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Section 2 CPU

Rev.1.00 Jun. 07, 2006 Page 23 of 1102

REJ09B0294-0100

2.2

CPU Operating Modes

The H8SX CPU has four operating modes: normal, middle, advanced and maximum modes. For

details on mode settings, see section 3.1, Operating Mode Selection.

CPU operating modes

Normal mode

Maximum mode

Maximum 64 kbytes for program

and data areas combined

Maximum 4 Gbytes for program

and data areas combined

Maximum 16-Mbyte program

area and 64-kbyte data area,

maximum 16 Mbytes for program

and data areas combined

Maximum 16-Mbyte program

area and 4-Gbyte data area,

maximum 4 Gbytes for program

and data areas combined

Advanced mode

Middle mode

Figure 2.1 CPU Operating Modes

2.2.1

Normal Mode

The exception vector table and stack have the same structure as in the H8/300 CPU.

Note: Normal mode is not supported in this LSI.

• Address Space

The maximum address space of 64 kbytes can be accessed.

• Extended Registers (En)

The extended registers (E0 to E7) can be used as 16-bit registers, or as the upper 16-bit

segments of 32-bit registers. When the extended register En is used as a 16-bit register it can

contain any value, even when the corresponding general register Rn is used as an address

pre-/post-increment or pre-/post-decrement and a carry or borrow occurs, however, the value in

the corresponding extended register En will be affected.)

• Instruction Set

All instructions and addressing modes can be used. Only the lower 16 bits of effective

addresses (EA) are valid.

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