HD6432345 Datasheet, PDF(89/907 Page) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

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HD6432345 Datasheet, PDF (89/907 Pages) Hitachi Semiconductor – H8S/2345 F-ZTAT Hardware Manual

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Section 3 MCU Operating Modes

3.1 Overview

3.1.1 Operating Mode Selection (F-ZTATâ¢ Version)

The H8S/2345 Series has eight operating modes (modes 4 to 7, 10, 11, 14 and 15). These modes

are determined by the mode pin (MD2 to MD0) and flash write enable pin (FWE) 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 (F-ZTATâ¢ Version)

MCU

CPU

Operating

Operating

Mode

FWE MD2 MD1 MD0 Mode

Description

0

0000â

â

External Data

Bus

On-Chip Initial Max.

ROM Width Width

â

â

â

1

1

2

10

3

1

4

1 0 0 Advanced On-chip ROM disabled, Disabled 16 bits 16 bits

5

1

expanded mode

8 bits 16 bits

6

10

On-chip ROM enabled, Enabled 8 bits 16 bits

expanded mode

7

1

Single-chip mode

â

â

8

1000â

â

â

â

â

9

1

10

1 0 Advanced Boot mode

Enabled 8 bits 16 bits

11

1

â

â

12

100â

â

â

â

â

13

1

14

1 0 Advanced User program mode Enabled 8 bits 16 bits

15

1

â

â

The CPU's architecture allows for 4 Gbytes of address space, but the H8S/2345 Series actually

accesses a maximum of 16 Mbytes.

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