H8SX1663 datasheet(83/1158 Pages) RENESAS

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Section 2 CPU

Rev.1.00 Jun. 07, 2006 Page 31 of 1102

REJ09B0294-0100

2.5.1

General Registers

The H8SX CPU has eight 32-bit general registers. These general registers are all functionally alike

and can be used as both address registers and data registers. When a general register is used as a

data register, it can be accessed as a 32-bit, 16-bit, or 8-bit register. Figure 2.10 illustrates the

usage of the general registers.

When the general registers are used as 32-bit registers or address registers, they are designated by

the letters ER (ER0 to ER7).

When the general registers are used as 16-bit registers, the ER registers are divided into 16-bit

general registers designated by the letters E (E0 to E7) and R (R0 to R7). These registers are

functionally equivalent, providing a maximum sixteen 16-bit registers. The E registers (E0 to E7)

are also referred to as extended registers.

When the general registers are used as 8-bit registers, the R registers are divided into 8-bit general

registers designated by the letters RH (R0H to R7H) and RL (R0L to R7L). These registers are

functionally equivalent, providing a maximum sixteen 8-bit registers.

The general registers ER (ER0 to ER7), R (R0 to R7), and RL (R0L to R7L) are also used as index

registers. The size in the operand field determines which register is selected.

The usage of each register can be selected independently.

Address registers

32-bit registers

32-bit index registers

16-bit registers

General registers E

(E0 to E7)

8-bit registers

General registers RH

(R0H to R7H)

16-bit registers

16-bit index registers

General registers R

(R0 to R7)

8-bit registers

8-bit index registers

General registers RL

(R0L to R7L)

General registers ER

(ER0 to ER7)

•

Figure 2.10 Usage of General Registers

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