HD6432142 datasheet(90/1177 Pages) RENESAS

Part #	HD6432142

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

PDF	1177 Pages

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Manufacturer	RENESAS [Renesas Technology Corp]

Direct Link	http://www.renesas.com

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Section 2 CPU

Rev. 4.00 Sep 27, 2006 page 46 of 1130

REJ09B0327-0400

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 this LSI, this register does not affect operation.

Bit 7—Trace Bit (T): This bit is reserved. In this LSI, 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 this LSI, these bits do not

affect operation.

HD6432142 Datasheet(PDF) 90 Page - Renesas Technology Corp