HD6413008F RENESAS [Renesas Technology Corp], HD6413008F Datasheet - Page 100

• Manufacturer Part Number: HD6413008F
• Description: Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series
• Manufacturer: RENESAS [Renesas Technology Corp]

3. MCU Operating Modes
Modes 1 to 4 are externally expanded modes that enable access to external memory and peripheral
devices and disable access to the on-chip ROM. Modes 1 and 2 support a maximum address space
of 1 Mbyte. Modes 3 and 4 support a maximum address space of 16 Mbytes.
The H8/3008 can be used only in modes 1 to 4. The inputs at the mode pins must select one of
these four modes. The inputs at the mode pins must not be changed during operation. Set the reset
state before changing the inputs at these pins.
3.1.2
The H8/3008 has a mode control register (MDCR) that indicates the inputs at the mode pins (MD
to MD
Table 3.2
Address*
H'EE011
H'EE012
Note:
3.2
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8/3008.
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
Rev.4.00 Aug. 20, 2007 Page 56 of 638
REJ09B0395-0400
Bit
Initial value
Read/Write
Note:
2
to MD
0
), and a system control register (SYSCR). Table 3.2 summarizes these registers.
* Lower 20 bits of the address in advanced mode.
*
Mode Control Register (MDCR)
Register Configuration
Determined by pins MD to MD .
0
(the current operating mode). MDS2 to MDS0 correspond to MD
Registers
Name
Mode control register
System control register
⎯
⎯
7
1
⎯
⎯
6
1
Reserved bits
2
⎯
⎯
5
0
0
SYSCR
Abbreviation
MDCR
⎯
⎯
4
0
⎯
⎯
3
0
R/W
R
R/W
MDS2
Mode select 2 to 0
Bits indicating the current
operating mode
⎯
R
2
*
Initial Value
Undetermined
H'09
2
MDS1
to MD
⎯
R
1
*
0
. MDS2 to
MDS0
⎯
R
0
*
2