H8SX1663 datasheet(118/1158 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev.1.00 Jun. 07, 2006 Page 66 of 1102

REJ09B0294-0100

Mode 7 is a single-chip initiation mode. In the initial state, all areas are designated to 8-bit access

space and all I/O ports can be used as general input/output ports. The external address space

cannot be accessed in the initial state, but setting the EXPE bit in the system control register

(SYSCR) to 1 enables to use the external address space. After the external address space is

enabled, ports D, E, and F can be used as an address output bus and ports H and I as a data bus by

specifying the data direction register (DDR) for each port.

Modes 4 to 6 are external extended modes, in which the external memory and devices can be

accessed. In the external extended modes, the external address space can be designated as 8-bit or

16-bit address space for each area by the bus controller after starting program execution.

If 16-bit address space is designated for any one area, it is called the 16-bit bus widths mode. If 8-

bit address space is designated for all areas, it is called the 8-bit bus width mode.

3.2

The following registers are related to the operating mode setting.

• Mode control register (MDCR)

• System control register (SYSCR)

3.2.1

Mode Control Register (MDCR)

MDCR indicates the current operating mode. When MDCR is read from, the states of signals

MD3 to MD0 are latched. Latching is released by a reset.

Bit

Bit Name

Initial Value

R/W

Note: * Determined by pins MD3 to MD0.

MDS7

Undefined*



MDS3

Undefined*

MDS2

Undefined*

MDS1

Undefined*

MDS0

Undefined*

Bit

Bit Name

Initial Value

R/W



Undefined*



Undefined*



Undefined*



Undefined*



Undefined*

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