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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 monitor the current operating mode.
Bit
Bit Name
7
EXPE
6
—
to
2
1
MDS1
0
MDS0
Note:
*
The initial values are determined by the settings of the MD1 and MD0 pins.
Rev. 1.00, 05/04, page 52 of 544
Initial
Value
R/W
Description
0
Reserved
R/W
The initial value should not be changed.
All 0
R
Reserved
These bits are always read as 0. These bits cannot be
modified.
—*
R
Mode Select 1 and 0
—*
R
These bits indicate the input levels at mode pins (MD1
and MD0) (the current operating mode). Bits MDS1
and MDS0 correspond to MD1 and MD0, respectively.
These bits are read-only bits and they cannot be
written to. The mode pin (MD1 and MD0) input levels
are latched into these bits when MDCR is read. These
latches are canceled by a reset.
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