Table of Contents
Table 3-2 Registers
Address* Name
H'FFF1
Mode control register
H'FFF2
System control register
Note: * The lower 16 bits of the address are indicated.
3.2 Mode Control Register (MDCR)
Bit
7
—
Initial value
1
Read/Write
—
Note:
Determined by pins MD and MD .
*
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8/3035
Series.
Bits 7 and 6—Reserved: These bits cannot be modified and are always read as 1.
Bits 5 to 3—Reserved: These bits cannot be modified and are always read as 0.
Bit 2—Reserved: This bit cannot be modified and is always read as 1.
Bits 1 and 0—Mode Select 1 and 0 (MDS1 and MDS0): These bits indicate the logic levels at
pins MD
and MD
(the current operating mode). MDS1 and MDS0 correspond to MD
1
0
MD
. MDS1 and MDS0 are read-only bits. The mode pin (MD
0
when MDCR is read.
54
Abbreviation
MDCR
SYSCR
6
5
4
—
—
—
1
0
0
—
—
—
Reserved bits
1
0
R/W
Initial Value
R
Undetermined
R/W
H'0B
3
2
1
—
—
MDS1
0
1
—
*
—
—
R
Mode select 1 and 0
Bits indicating the current
operating mode
and MD
) levels are latched
1
0
0
MDS0
—
*
R
and
1
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