Mode Control Register (Mdcr) - Hitachi F-ZTAT H8/3039 Series Hardware Manual

3.2 Mode Control Register (MDCR)

MDCR is an 8-bit read-only register that indicates the current operating mode of the H8/3039
Series.
Bit
Initial value
Read/Write
Note: Determined by pins MD to MD .
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.
Bits 2 to 0—Mode Select 2 to 0 (MDS
MD to MD (the current operating mode). MDS
2 0
MDS are read-only bits. The mode pin (MD
0
7 6
— —
1 1
— —
Reserved bits
2
2
5 4
— —
0 0
— —
0
to MDS ): These bits indicate the logic levels at pins
0
to MDS correspond to MD
2 0
to MD ) levels are latched when MDCR is read.
2 0
3 2
— MDS2 MDS1
0 — *
— R
Mode select 2 to 0
Bits indicating the current
operating mode
to MD
2
1 0
MDS0
— * — *
R R
. MDS and
0 1
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