HD6432142 datasheet(127/1177 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev. 4.00 Sep 27, 2006 page 83 of 1130

REJ09B0327-0400

Section 3 MCU Operating Modes

3.1

Overview

3.1.1

Operating Mode Selection

This LSI has three operating modes (modes 1 to 3). These modes enable selection of the CPU

operating mode and enabling/disabling of on-chip ROM, by setting the mode pins (MD1 and

MD0).

Table 3.1 lists the MCU operating modes.

Table 3.1

MCU Operating Mode Selection

MCU

Operating

Mode

MD1

MD0

CPU

Operating

Mode

Description

On-Chip

ROM

—

Normal

Expanded mode with on-chip ROM disabled

Disabled

Advanced

Expanded mode with on-chip ROM enabled

Single-chip mode

Enabled

Normal

Expanded mode with on-chip ROM enabled

Single-chip mode

The CPU’s architecture allows for 4 Gbytes of address space, but this LSI actually access a

maximum of 16 Mbytes.

Mode 1 is an externally expanded mode that allows access to external memory and peripheral

devices. With modes 2 and 3, operation begins in single-chip mode after reset release, but a

transition can be made to external expansion mode by setting the EXPE bit in MDCR.

This LSI can only be used in modes 1 to 3. These means that the mode pins must select one of

these modes. Do not changes the inputs at the mode pins during operation.

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