HD6412332 RENESAS [Renesas Technology Corp], HD6412332 Datasheet - Page 102

• Manufacturer Part Number: HD6412332
• Description: Renesas 16-Bit Single-Chip Microcomputer H8S Family/H8S/2300 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

3.1.3
The chip has a mode control register (MDCR) that indicates the inputs at the mode pins (MD
MD
control the operation of the chip. Table 3.3 summarizes these registers.
Table 3.3
Name
Mode control register
System control register
System control register 2 *
Notes: 1. Lower 16 bits of the address.
3.2
3.2.1
Note: * Determined by pins MD
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8S/2339
Group chip.
Bit 7—Reserved: This bit is always read as 1, and cannot be modified.
Bits 6 to 3—Reserved: These bits are 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
MD
MDS2 to MDS0 are read-only bits, and cannot be written to. The mode pin (MD
levels are latched into these bits when MDCR is read. These latches are canceled by a reset.
Rev.4.00 Sep. 07, 2007 Page 72 of 1210
REJ09B0245-0400
Bit
Initial value :
R/W
0
2
), and a system control register (SYSCR) and system control register 2 (SYSCR2) *
to MD
2. The SYSCR2 register can only be used in the F-ZTAT version. In the mask ROM and
Register Configuration
Register Descriptions
Mode Control Register (MDCR)
ROMless versions this register will return an undefined value if read, and cannot be
modified.
0
Registers
(the current operating mode). Bits MDS2 to MDS0 correspond to pins MD
:
:
—
—
7
1
2
Abbreviation
MDCR
SYSCR
SYSCR2
—
—
2
6
0
to MD
0
.
—
—
5
0
R/W
R
R/W
R/W
—
—
4
0
—
—
3
0
Initial Value
Undefined
H'01
H'00
MDS2
— *
R
2
MDS1
2
— *
to MD
Address *
H'FF3B
H'FF39
H'FF42
R
1
2
2
0
that
) input
to MD
MDS0
— *
1
2
R
0
to
0
.