HD6432351 datasheet(103/1025 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev. 3.00 Sep 15, 2006 page 69 of 988

REJ09B0330-0300

Section 3 MCU Operating Modes

3.1

Overview

3.1.1

H8S/2350 Operating Mode Selection

The H8S/2350 has three operating modes (modes 1, 4, and 5). These modes are determined by the

mode pin (MD2 to MD0) settings. The CPU operating mode and initial bus width can be selected

as shown in table 3.1.

Table 3.1 lists the MCU operating modes.

Table 3.1

MCU Operating Mode Selection (H8S/2350)

External Data Bus

MCU

Operating

Mode

MD2 MD1 MD0

CPU

Operating

Mode

Description

On-Chip

ROM

Initial

Width

Max.

Width

—

Normal

On-chip ROM

disabled, expanded

mode

Disabled 8 bits

16 bits

—

Advanced

Disabled 16 bits

16 bits

On-chip ROM

disabled, expanded

mode

8 bits

16 bits

—

The CPU’s architecture allows for 4 Gbytes of address space, but the H8S/2350 actually accesses

a maximum of 16 Mbytes.

Modes 1, 4, and 5 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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