SH7018 datasheet(57/431 Pages) RENESAS

57 / 431 page

Section 3 Operating Modes

3.1

Operating Mode Selection

The SH7018 has four operating modes: MCU mode, boot mode, user program mode, and

programmer mode. The settings of the mode pins (MD3 to MD0) determine the mode in which the

chip operates. The mode pin settings must not be changed while the chip is operating (while power

is being supplied).

The method of selecting the operating mode is shown in table 3.1.

Table 3.1

Operating Mode Selection

Pin Settings

FWP

MD3*

MD2*

MD1

MD0

Operating Mode

On-Chip ROM CS0 Bus Width

10010

MCU mode

Enabled

8 bits*

00000

Boot mode*

Enabled

8 bits*

00010

User program mode*

Enabled

8 bits*

11101

Programmer mode*

Enabled

—

Notes: 1. F-ZTAT version only.

2. Set using BCR1 of BSC.

3.2

Description of Operating Modes

MCU Mode: The on-chip ROM is enabled in the MCU mode. The bus width for the on-chip

ROM space is 32 bits.

Boot Mode: Refer to section 16.6.1 Boot Mode for information on the boot mode.

User Program Mode: Refer to section 16.6.2 User Program Mode for information on the user

program mode.

Programmer Mode: Refer to section 16.11 Flash Memory Programmer Mode for information on

the programmer mode.

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