HD6412340 HITACHI [Hitachi Semiconductor], HD6412340 Datasheet - Page 92

• Manufacturer Part Number: HD6412340
• Description: H8S/2345 F-ZTAT Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

3.1.3
The H8S/2345 Series has a mode control register (MDCR) that indicates the inputs at the mode
pins (MD
(SYSCR2)*
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
MDCR is an 8-bit read-only register that indicates the current operating mode of the H8S/2345
Series.
Bit 7—Reserved: Read-only bit, always read as 1.
Bits 6 to 3—Reserved: Read-only bits, always read as 0.
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-they cannot be written to. The mode pin (MD
levels are latched into these bits when MDCR is read. These latches are canceled by a power-on
reset, but are retained after a manual reset.
72
Bit
Initial value
R/W
Note: * Determined by pins MD
2
to MD
2. The SYSCR2 register can only be used in the F-ZTAT version. In the ZTAT, mask
2
Register Configuration
Register Descriptions
Mode Control Register (MDCR)
to MD
ROM, and ROMless versions, this register cannot be written to and will return an
undefined value of read.
2
0
(the current operating mode). Bits MDS2 to MDS0 correspond to MD
that control the operation of the H8S/2345 Series. Table 3.3 summarizes these
MCU Registers
:
:
:
0
), and a system control register (SYSCR) and a system control register 2
—
—
7
1
2
Abbreviation
MDCR
SYSCR
SYSCR2
—
—
6
0
2
to MD
—
—
5
0
0
.
R/W
R
R/W
R/W
—
—
4
0
—
—
3
0
Initial Value
Undetermined
H'01
H'00
MDS2
—*
R
2
MDS1
—*
R
1
2
to MD
Address*
H'FF3B
H'FF39
H'FF42
2
to MD
MDS0
0
) input
—*
R
0
0
.
1