H8SSLASH2214 datasheet(132/936 Pages) RENESAS

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Section 3 MCU Operating Modes

Rev.4.00 Sep. 18, 2008 Page 72 of 872

REJ09B0189-0400

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

The H8S/2214 Group can be used only in modes 4 to 7. 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

The H8S/2214 Group has a mode control register (MDCR) that indicates the inputs at the mode

pins (MD2 to MD0), and a system control register (SYSCR) that controls the operation of the

H8S/2214 Group. Table 3.2 summarizes these registers.

Table 3.2

MCU Registers

Name

Abbreviation

R/W

Initial Value

Address*

Mode control register

MDCR

Undetermined

H'FDE7

System control register

SYSCR

R/W

H'01

H'FDE5

Note: * Lower 16 bits of the address.

3.2

3.2.1

Mode Control Register (MDCR)

—

MDS0

—*

MDS2

—*

MDS1

—*

Note: * Determined by pins MD2 to MD0.

Bit

Initial value

R/W

MDCR is an 8-bit read-only register that indicates the current operating mode of the H8S/2214

Group.

Bit 7—Reserved: Read-only bit, always read as 1.

Bits 6 to 3—Reserved: Read-only bits, always read as 0.

Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the input levels at pins

MD2 to MD0 (the current operating mode). Bits MDS2 to MDS0 correspond to MD2 to MD0.

MDS2 to MDS0 are read-only bits-they cannot be written to. The mode pin (MD2 to MD0) input

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