H8SSLASH2214 datasheet(131/936 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev.4.00 Sep. 18, 2008 Page 71 of 872

REJ09B0189-0400

Section 3 MCU Operating Modes

3.1

Overview

3.1.1

Operating Mode Selection

The H8S/2214 Group has four operating modes (modes 4 to 7). These modes enable selection of

the CPU operating mode, enabling/disabling of on-chip ROM, and the initial bus width setting, by

setting the mode pins (MD2 to MD0).

Table 3.1 lists the MCU operating modes.

Table 3.1

MCU Operating Mode Selection

External Data Bus

MCU

Operating

Mode

MD2 MD1 MD0

CPU

Operating

Mode

Description

On-Chip

ROM

Initial

Width

Max.

Width

—

Advanced

Disabled

16 bits

On-chip ROM disabled,

expanded mode

8 bits

16 bits

On-chip ROM enabled,

expanded mode

Enabled

8 bits

16 bits

Single-chip mode

—

Note: * Not available in the H8S/2214 Group.

The CPU’s architecture allows for 4 Gbytes of address space, but the H8S/2214 Group actually

accesses a maximum of 16 Mbytes.

Modes 4 to 6 are externally expanded modes that allow access to external memory and peripheral

devices.

The external expansion modes allow switching between 8-bit and 16-bit bus modes. After program

execution starts, an 8-bit or 16-bit address space can be set for each area, depending on the bus

controller setting. If 16-bit access is selected for any one area, 16-bit bus mode is set; if 8-bit

access is selected for all areas, 8-bit bus mode is set.

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