H8SSLASH2214 datasheet(80/936 Pages) RENESAS

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Section 2 CPU

Rev.4.00 Sep. 18, 2008 Page 20 of 872

REJ09B0189-0400

• Higher speed

⎯ Basic instructions execute twice as fast

2.2

CPU Operating Modes

The H8S/2000 CPU has two operating modes: normal* and advanced. Normal mode supports a

maximum 64-kbyte address space. Advanced mode supports a maximum 16-Mbyte total address

space (architecturally a maximum 16-Mbyte program area and a maximum of 4 Gbytes for

program and data areas combined). The mode is selected by the mode pins of the microcontroller.

Note: * Not available in the H8S/2214 Group.

CPU operating modes

Normal mode*

Note: * Not available in the H8S/2214 Group.

Advanced mode

Maximum 64-kbytes, program

and data areas combined

Maximum 16-Mbytes for

program and data areas

combined

Figure 2.1 CPU Operating Modes

(1) Normal Mode (not available in the H8S/2214 Group)

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

(a) Address Space

A maximum address space of 64 kbytes can be accessed.

(b) 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 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 register. If the general register is

referenced in the register indirect addressing mode with pre-decrement (@–Rn) or post-increment

(@Rn+) and a carry or borrow occurs, however, the value in the corresponding extended register

(En) will be affected.

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