HD6433044 Hitachi Semiconductor, HD6433044 Datasheet - Page 652

• Manufacturer Part Number: HD6433044
• Description: (HD64 Series) Hitachi Single-Chip Microcomputer
• Manufacturer: Hitachi Semiconductor

20.2 Register Configuration
The H8/3048 Series has a system control register (SYSCR) that controls the power-down state,
and a module standby control register (MSTCR) that controls the module standby function. Table
20-2 summarizes these registers.
Table 20-2 Control Register
Address*
H'FFF2
H'FF5E
Note: * Lower 16 bits of the address.
20.2.1 System Control Register (SYSCR)
SYSCR is an 8-bit readable/writable register. Bit 7 (SSBY) and bits 6 to 4 (STS2 to STS0) control
the power-down state. For information on the other SYSCR bits, see section 3.3, System Control
Register (SYSCR).
Bit
Initial value
Read/Write
Name
System control register
Module standby control register
SSBY
Software standby
Enables transition to
software standby mode
R/W
7
0
STS2
R/W
6
0
STS1
Standby timer select 2 to 0
These bits select the
waiting time at exit from
software standby mode
R/W
5
0
643
STS0
Abbreviation
SYSCR
MSTCR
R/W
4
0
User bit enable
R/W
UE
3
1
NMIEG
R/W
R/W
R/W
NMI edge select
R/W
2
0
Initial Value
H'0B
H'40
Reserved bit
—
—
1
1
RAM enable
RAME
R/W
0
1