Datasheet

Section 3 MCU Operating Modes

Rev. 6.00 Mar. 18, 2010 Page 104 of 982

REJ09B0054-0600

3.2 Register Descriptions

The following registers are related to the operating mode.

• Mode control register (MDCR)

• System control register (SYSCR)

3.2.1 Mode Control Register (MDCR)

MDCR is used to monitor the current operating mode of this LSI.

Bit Bit Name Initial Value R/W Description

7 — 1 — Reserved

This bit is always read as 1 and cannot be modified.

6 to 3 — All 0 — Reserved

These bits are always read as 0 and cannot be

modified.

MDS2

MDS1

MDS0

—

Mode Select 2 to 0

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 and they cannot be written to. The

mode pin (MD2 to MD0) input levels are latched into

these bits when MDCR is read.

These latches are canceled by a power-on reset, but

maintained at manual reset.

Note: * Determined by the MD2 to MD0 pin settings.