Datasheet

Section 3 MCU Operating Modes
Page 98 of 1434 R01UH0166EJ0600 Rev. 6.00
Mar 02, 2011
H8S/2633 Group, H8S/2633 F-ZTAT
TM
,
H8S/2633R F-ZTAT
TM
, H8S/2695
Note that the functions of each pin depend on the operating mode.
The H8S/2633 Group 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 Register Configuration
The H8S/2633 Group 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
H8S/2633 Group. Table 3.2 summarizes these registers.
Table 3.2 MCU Registers
Name Abbreviation R/W Initial Value Address
*
Mode control register MDCR R/W Undetermined H'FDE7
System control register SYSCR R/W H'01 H'FDE5
Pin function control register PFCR R/W H'0D/H'00 H'FDEB
Note: * Lower 16 bits of the address.
3.2 Register Descriptions
3.2.1 Mode Control Register (MDCR)
7
—
1
R/W
6
—
0
—
5
—
0
—
4
—
0
—
3
—
0
—
0
MDS0
—*
R
2
MDS2
—*
R
1
MDS1
—*
R
Note: * Determined by pins MD2 to MD0.
Bit
Initial value
R/W
:
:
:
MDCR is an 8-bit register that indicates the current operating mode of the H8S/2633 Group.
Bit 7—Reserved: Only 1 should be written to this bit.
Bits 6 to 3—Reserved: These bits always read as 0 and cannot be modified.
Bits 2 to 0—Mode Select 2 to 0 (MDS2 to MDS0): These bits indicate the input levels at pins
MD2 to MD0 (the current operating mode). Bits MDS2 to MDS0 correspond to MD2 to MD0.
MDS2 to MDS0 are read-only bits-they cannot be written to. The mode pin (MD2 to MD0) input