H83029 datasheet(86/1010 Pages) RENESAS

86 / 1010 page

Rev. 2.0, 06/04, page 59 of 980

Section 3 MCU Operating Modes

3.1

Overview

3.1.1

Operating Mode Selection

The H8/3029 has six operating modes (modes 1 to 5, 7) that are selected by the mode pins (MD

to MD

0) 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

Description

Operating

Mode Pins

Initial Bus On-Chip

On-Chip

Mode

Address Space

Mode*

ROM

RAM

—

Mode 1

Expanded mode

8 bits

Disabled

Enabled*

Mode 2

Expanded mode

16 bits

Disabled

Enabled*

Mode 3

Expanded mode

8 bits

Disabled

Enabled*

Mode 4

Expanded mode

16 bits

Disabled

Enabled*

Mode 5

Expanded mode

8 bits

Enabled

Enabled*

—

Mode 7

Single-chip advanced

mode

—

Enabled

Notes: *1 In modes 1 to 5, 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 RAME bit in SYSCR is cleared to 0, these addresses become external

addresses.

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

either 8 or 16 bits wide depending on ABWCR settings. If 8-bit access is selected for all areas, 8-

bit bus mode is used. For details see section 6, Bus Controller.

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

devices and disable access to the on-chip ROM. Modes 1 and 2 support a maximum address space

of 1 Mbyte. Modes 3 and 4 support a maximum address space of 16 Mbytes.

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