HD643303x Hitachi, HD643303x Datasheet - Page 427

• Manufacturer Part Number: HD643303x
• Description: Hitachi Microcomputer
• Manufacturer: Hitachi

16.2 Register Configuration
The H8/3032 Series’ system control register (SYSCR) controls the power-down state. Table 16-2
summarizes this register.
Table 16-2 Control Register
Address*
H'FFF2
Note: * Lower 16 bits of the address.
16.2.1 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.
Bit
Initial value
Read/Write
Name
System 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
Abbreviation
SYSCR
412
STS0
R/W
4
0
User bit enable
R/W
UE
3
1
R/W
R/W
NMIEG
NMI edge select
R/W
2
0
Initial Value
H'0B
Reserved bit
—
—
1
1
RAM enable
RAME
R/W
0
1