HD64F2149YV datasheet(107/1075 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev. 3.00 Jan 18, 2006 page 79 of 1044

REJ09B0280-0300

Section 3 MCU Operating Modes

3.1

Overview

3.1.1

Operating Mode Selection

The H8S/2169 or H8S/2149 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

00—

—

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 the H8S/2169 or H8S/2149

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.

The H8S/2169 or H8S/2149 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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