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3.1.2
Register Configuration
The H8/3006 and H8/3007 have a mode control register (MDCR) that indicates the inputs at the
mode pins (MD
to MD
2
registers.
Table 3-2
Registers
Address*
Name
H'EE011
Mode control register
H'EE012
System control register
Note:
*
Lower 20 bits of the address in advanced mode.
3.2
Mode Control Register (MDCR)
MDCR is an 8-bit read-only register that indicates the current operating mode of the
H8/3006 and H8/3007.
Bit
—
Initial value
Read/Write
—
Note:
*
Determined by pins MD to MD .
Bits 7 and 6—Reserved: These bits can not be modified and are always read as 1.
Bits 5 to 3—Reserved: These bits can not be modified and are always read as 0.
Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the logic levels at pins
MD
to MD
(the current operating mode). MDS2 to MDS0 correspond to MD
2
0
MDS0 are read-only bits. The mode pin (MD
MDCR is read.
58
), and a system control register (SYSCR). Table 3-2 summarizes these
0
7
6
5
—
—
1
1
0
—
—
Reserved bits
2
0
Abbreviation
R/W
MDCR
R
SYSCR
R/W
4
3
—
—
0
0
—
—
to MD
) levels are latched into these bits when
2
0
Initial Value
Undetermined
H'09
2
1
MDS2
MDS1
MDS0
—
*
—
*
R
R
Mode select 2 to 0
Bits indicating the current
operating mode
to MD
. MDS2 to
2
0
0
—
*
R
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