HD6432138SW datasheet(90/1061 Pages) RENESAS

Il numero della parte	HD6432138SW

Spiegazioni elettronici	Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2100 Series

PDF	1061 Pages

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Produttore elettronici	RENESAS [Renesas Technology Corp]

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90 / 1061 page

Section 2 CPU

Rev. 4.00 Jun 06, 2006 page 36 of 1004

REJ09B0301-0400

Free area

Stack area

SP (ER7)

Figure 2.9 Stack

2.4.3

Control Registers

The control registers are the 24-bit program counter (PC), 8-bit extended control register (EXR),

and 8-bit condition-code register (CCR).

(1) Program Counter (PC)

This 24-bit counter indicates the address of the next instruction the CPU will execute. The length

of all CPU instructions is 2 bytes (one word), so the least significant PC bit is ignored. (When an

instruction is fetched, the least significant PC bit is regarded as 0.)

(2) Extended Control Register (EXR)

An 8-bit register. In the H8S/2138 Group and H8S/2134 Group, this register does not affect

operation.

Bit 7—Trace Bit (T): This bit is reserved. In the H8S/2138 Group and H8S/2134 Group, this bit

does not affect operation.

Bits 6 to 3—Reserved: These bits are reserved. They are always read as 1.

Bits 2 to 0—Interrupt Mask Bits (I2 to I0): These bits are reserved. In the H8S/2138 Group and

H8S/2134 Group, these bits do not affect operation.

HD6432138SW Scheda tecnica(PDF) 90 Page - Renesas Technology Corp