h8s-2635 Renesas Electronics Corporation., h8s-2635 Datasheet - Page 140

• Manufacturer Part Number: h8s-2635
• Description: Renesas 16-bit Single-chip Microcomputer H8s Family/h8s/2600 Series
• Manufacturer: Renesas Electronics Corporation.

Section 3 MCU Operating Modes
the bus controller setting. If 16-bit access is selected for any one area, 16-bit bus mode is set; if 8-
bit access is selected for all areas, 8-bit bus mode is set.
Note that the functions of each pin depend on the operating mode.
The chip can be used only in modes 4 to 7. This means that the mode pins must be set to select one
of these modes. Do not change the inputs at the mode pins during operation.
3.1.2
The chip has a mode control register (MDCR) that indicates the inputs at the mode pins (MD2 to
MD0), and a system control register (SYSCR) that controls the operation of the chip. Table 3-2
summarizes these registers.
Table 3-2
Note: * Lower 16 bits of the address.
3.2
3.2.1
MDCR is an 8-bit register that indicates the current operating mode of the chip.
Rev. 6.00 Feb 22, 2005 page 80 of 1484
REJ09B0103-0600
Name
Mode control register
System control register
Pin function control register
Bit
Initial value
R/W
Note: * Determined by pins MD2 to MD0.
Register Configuration
Register Descriptions
Mode Control Register (MDCR)
MCU Registers
:
:
:
R/W

7
1


6
0
Abbreviation
SYSCR
MDCR
PFCR


5
0


4
0
R/W
R
R/W
R/W


3
0
Initial Value
Undetermined
H'01
H'0D/H'00
MDS2
*
R
2
MDS1
*
R
1
Address *
H'FDE7
H'FDE5
H'FDEB
MDS0
*
R
0