H8SLASH3024 datasheet(96/841 Pages) RENESAS

96 / 841 page

Section 3 MCU Operating Modes

Rev. 2.00 Sep 20, 2005 page 58 of 800

REJ09B0260-0200

Mode 5 is an externally expanded mode that enables access to external memory and peripheral

devices and also enables access to the on-chip ROM. Mode 5 supports a maximum address space

of 16 Mbytes.

Modes 6 and 7 are single-chip modes in which the chip operates using only the on-chip ROM,

RAM, and I/O registers. All ports are available in these modes. Mode 6 supports a maximum

address space of 64 kbytes. Mode 7 supports a maximum address space of 1 Mbyte.

The H8/3024 Group can be used only in modes 1 to 7. The inputs at the mode pins must select one

of these seven modes. The inputs at the mode pins must not be changed during operation. Set the

reset state before changing the inputs at these pins.

3.1.2

The H8/3024 Group has a mode control register (MDCR) that indicates the inputs at the mode

pins (MD2 to MD0), and a system control register (SYSCR). Table 3.2 summarizes these registers.

Table 3.2

Registers

Address*

Name

Abbreviation

R/W

Initial Value

H'EE011

Mode control register

MDCR

Undetermined

H'EE012

System control register

SYSCR

R/W

H'09

Note: * Lower 20 bits of the address in advanced mode.

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