H8SLASH3003 datasheet(75/715 Pages) RENESAS

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Section 3 MCU Operating Modes

3.1 Overview

3.1.1 Operating Mode Selection

The H8/3003 has four operating modes (modes 1 to 4) that are selected by the mode pins (MD2 to

MD0) as indicated in table 3-1. The input at these pins determines the size of the address space

and the initial bus mode.

Table 3-1 Operating Mode Selection

Mode Pins

Description

Operating Mode

MD2 MD1 MD0

Address Space

Initial Bus Mode*1

On-Chip RAM

—

000

—

Mode 1

1 Mbyte

8 bits

Enabled*2

Mode 2

1 Mbyte

16 bits

Enabled*2

Mode 3

16 Mbytes

8 bits

Enabled*2

Mode 4

16 Mbytes

16 bits

Enabled*2

—

101

—

110

—

111

—

Notes: 1. In all modes, an 8-bit or 16-bit data bus can be selected on a per-area basis by settings

made in the area bus width control register (ABWCR). For details see section 6, Bus

Controller.

2. If the RAM enable bit (RAME) in the system control register (SYSCR) is cleared to 0,

these addresses become external addresses.

For the address space size there are two choices: 1 Mbyte or 16 Mbytes. The external data bus is

either 8 or 16 bits wide depending on the settings in the area bus width control register (ABWCR).

If 8-bit access is selected for all areas, the external data bus is 8 bits wide. For details see

section 6, Bus Controller.

Modes 1 to 4 are externally expanded modes that enable access to external memory and peripheral

devices. Modes 1 and 2 support a maximum address space of 1 Mbyte. Modes 3 and 4 support a

maximum address space of 16 Mbytes.

The H8/3003 can only be used in modes 1 to 4. The inputs at the mode pins must select one of

these four modes. The inputs at the mode pins must not be changed during operation.

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