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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)
3.2.1
Mode Control Register (MDCR)
MDCR is used to monitor the current operating mode of this LSI.
Bit
Bit Name
7
–
6 to 3
–
2
MDS2
1
MDS1
0
MDS0
Note:* Determined by the MD2 to MD0 pin settings.
Rev. 3.0, 10/02, page 56 of 686
Initial Value R/W
1
–
0
–
–*
R
–*
R
–*
R
Description
Reserved
This bit is always read as 1 and cannot be modified.
Reserved
These bits are always read as 0 and cannot be
modified.
Mode select 2–0: 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.
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