HD64F3039F18 Datasheet, PDF (83/710 Pages) Renesas Technology Corp – Renesas 16-Bit Single-Chip Microcomputer H8 Family / H8/300H Series

Section 3 MCU Operating Modes
3.2 Mode Control Register (MDCR)
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8/3039
Group.
Bit
7
6
5
4
3
2
1
0
—
—
—
—
— MDS2 MDS1 MDS0
Initial value
1
1
0
0
0
—*
—*
—*
Read/Write
—
—
—
—
—
R
R
R
Reserved bits
Note: Determined by pins MD₂ to MD₀.
Mode select 2 to 0
Bits indicating the current
operating mode
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 (MDS₂ to MDS₀): These bits indicate the logic levels at pins
MD₂ to MD₀ (the current operating mode). MDS₂ to MDS₀ correspond to MD₂ to MD₀. MDS₁ and
MDS₀ are read-only bits. The mode pin (MD₂ to MD₀) levels are latched when MDCR is read.
Rev.3.00 Mar. 26, 2007 Page 59 of 682
REJ09B0353-0300