Datasheet

Section 3 MCU Operating Modes
Rev. 3.00 Sep. 28, 2009 Page 52 of 710
REJ09B0384-0300
3.2 Register Descriptions
The following registers are related to the operating mode.
• Mode control register (MDCR)
• System control register (SYSCR)
• Serial timer control register (STCR)
3.2.1 Mode Control Register (MDCR)
MDCR is used to set an operating mode and to monitor the current operating mode.
Bit Bit Name Initial Value R/W Description
7 ⎯ 0 R/W Reserved
The initial value should not be changed.
6 to
3
⎯ All 0 R Reserved
The initial value should not be changed.
2
1
MDS2
MDS1
⎯*
⎯*
R
R
Mode Select 2 and 1
These bits indicate the input levels at mode pins (MD2
and MD1) (the current operating mode). Bits MDS2
and MDS1 correspond to MD2, MD1, and MD0,
respectively. MDS2 and MDS1 are read-only bits and
they cannot be written to. The mode pin (MD2 and
MD1) input levels are latched into these bits when
MDCR is read. These latches are canceled by a reset.
0 ⎯ 0 R Reserved
The initial value should not be changed.
Note: * The initial values are determined by the settings of the MD2 and MD1 pins.