HD6432351 datasheet(104/1025 Pages) RENESAS

104 / 1025 page

Section 3 MCU Operating Modes

Rev. 3.00 Sep 15, 2006 page 70 of 988

REJ09B0330-0300

Note that the functions of each pin depend on the operating mode.

The H8S/2350 can be used only in modes 1, 4, and 5. This means that the mode pins must be set

to select one of these modes. Do not change the inputs at the mode pins during operation.

3.1.2

H8S/2351 Operating Mode Selection

The H8S/2351 has seven operating modes (modes 1 to 7). These modes enable selection of the

CPU operating mode, enabling/disabling of on-chip ROM, and the initial bus width setting, by

setting the mode pins (MD2 to MD0).

Table 3.2 lists the MCU operating modes.

Table 3.2

MCU Operating Mode Selection (H8S/2351)

External Data Bus

MCU

Operating

Mode

MD2 MD1 MD0

CPU

Operating

Mode

Description

On-Chip

ROM

Initial

Width

Max.

Width

—

Normal

On-chip ROM

disabled, expanded

mode

Disabled

8 bits

16 bits

On-chip ROM

enabled, expanded

mode

Enabled

8 bits

16 bits

Single-chip mode

—

Advanced

Disabled

16 bits

On-chip ROM

disabled, expanded

mode

8 bits

16 bits

On-chip ROM

enabled, expanded

mode

Enabled

8 bits

16 bits

Single-chip mode

—

The CPU’s architecture allows for 4 Gbytes of address space, but the H8S/2351 actually accesses

a maximum of 16 Mbytes.

Modes 1, 2, and 4 to 6 are externally expanded modes that allow access to external memory and

peripheral devices.

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