HD6413007F20 Datasheet, PDF (90/798 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

3. MCU Operating Modes
When changing the mode, the chip must be placed in the reset state before the mode pin inputs are
changed.
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 (MD₂ to MD₀), and a system control register (SYSCR). Table 3.2 summarizes these
registers.
Table 3.2 Registers
Address*
Name
Abbreviation R/W
H'EE011
Mode control register
MDCR
R
H'EE012
System control register SYSCR
R/W
Note: * Lower 20 bits of the address in advanced mode.
Initial Value
Undetermined
H'09
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
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
Mode select 2 to 0
Bits indicating the current
operating mode
Note: * Determined by pins MD₂ to MD₀.
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
MD₂ to MD₀ (the current operating mode). MDS2 to MDS0 correspond to MD₂ to MD₀. MDS2 to
MDS0 are read-only bits. The mode pin (MD₂ to MD₀) levels are latched into these bits when
MDCR is read.
Rev.5.00 Sep. 12, 2007 Page 60 of 764
REJ09B0396-0500