Register Configuration; Overview; General Registers - Renesas H8S Series Hardware Manual

16-bit single-chip microcomputer

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Register Configuration

The CPU has the internal registers shown in figure 2-4. There are two types of registers: general registers and control

General Registers (Rn) and Extended Registers (En)

Control Registers (CR)

Note: * In the H8S/2357 Group, this bit cannot be used as an interrupt mask.

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

letters ER (ER0 to ER7).

The ER registers divide 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.

Stack pointer

Program counter

Extended control register

Interrupt mask bits

Condition-code register

Interrupt mask bit

User bit or interrupt mask bit*

Figure 2-4 CPU Registers

Half-carry flag

Negative flag

Overflow flag

7 6 5 4 3 2 1 0

T — — — — I2 I1 I0

7 6 5 4 3 2 1 0

I UI H U N Z V C

Rev.6.00 Oct.28.2004 page 27 of 1016

REJ09B0138-0600H