Register Configuration; Overview - Hitachi H8S/2646 Hardware Manual

Hitachi 16-bit single-chip microcomputer h8s/2646 series

Table of Contents

Register Configuration

The CPU has the internal registers shown in figure 2-7. There are two types of registers: general

registers and control registers.

General Registers (Rn) and Extended Registers (En)

Control Registers (CR)

Stack pointer

Program counter

Extended control register

Interrupt mask bits

Condition-code register

Interrupt mask bit

User bit or interrupt mask bit*

Note: * Cannot be used as an interrupt mask bit in the H8S/2646 Series.

Sign extension

Figure 2-7 CPU Registers

Half-carry flag

Negative flag

Overflow flag

Multiply-accumulate register

7 6 5 4 3 2 1 0

T — — — — I2 I1 I0

7 6 5 4 3 2 1 0

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