HD6432633 Datasheet, PDF (150/1453 Pages) Renesas Technology Corp – Series of Microcomputers (MCUs: microcomputer units)

The H8S/2633 Series 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 Series 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 Series. Table 3-2 summarizes these registers.
Table 3-2 MCU Registers
Name
Abbreviation R/W
Mode control register
MDCR
R/W
System control register
SYSCR
R/W
Pin function control register PFCR
R/W
Note: * Lower 16 bits of the address.
Initial Value
Undetermined
H'01
H'0D/H'00
Address*
H'FDE7
H'FDE5
H'FDEB
3.2 Register Descriptions
3.2.1 Mode Control Register (MDCR)
Bit
:
7
6
5
4
—
—
—
—
Initial value :
1
0
0
0
R/W
: R/W
—
—
—
3
2
1
0
— MDS2 MDS1 MDS0
0
—*
—*
—*
—
R
R
R
Note: * Determined by pins MD2 to MD0.
MDCR is an 8-bit register that indicates the current operating mode of the H8S/2633 Series.
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
levels are latched into these bits when MDCR is read. These latches are cancelled by a power-on
reset, but maintained by a manual reset.
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