H8SSLASH2224 datasheet(189/1071 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev. 5.00 Aug 08, 2006 page 103 of 982

REJ09B0054-0500

Section 3 MCU Operating Modes

3.1

Operating Mode Selection

The LSI supports four operating modes (modes 7 to 4). These operating modes are used to switch

the pin functions. The operating mode is determined by the setting of the mode pins (MD2 to

MD0). Modes 6 to 4 are external extended modes used to access external memory or peripheral

devices. In the external extended modes each area can be specified as an 8-bit or 16-bit address

space using the bus controller after program execution starts. In addition, the 16-bit bus mode is

used if any of the areas is configured as 16-bit address space. The 8-bit bus mode is used if all

areas are configured as 8-bit address space.

Mode 7 does not use external address space. Do not change the mode pin setting during operation.

Table 3.1

MCU Operating Mode Selection

External Data Bus

MCU

Operating

Mode

MD2 MD1 MD0

CPU Operating

Mode

Description

On-chip

ROM

Initial Value

Maximum

Value

100Advanced mode

On-chip ROM

disabled, extended

mode

Disabled

16 bits

101Advanced mode

On-chip ROM

disabled, extended

mode

Disabled

8 bits

16 bits

110Advanced mode

On-chip ROM

enabled, extended

mode

Enabled

8 bits

16 bits

111Advanced mode

Single-chip mode

Enabled

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