Register Configuration; System Control Register (Syscr) - Hitachi H8/3035 Series Hardware Manual

16.2 Register Configuration

The system control register (SYSCR) controls the power-down state. Table 16-2 summarizes this
register.
Table 16-2 Control Register
Address* Name
H'FFF2 System control register
Note: * Lower 16 bits of the address.

16.2.1 System Control Register (SYSCR)

Bit 7
SSBY
Initial value 0
Read/Write R/W
Software standby
Enables transition to
software standby mode
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.
384
Abbreviation
SYSCR
6 5 4
STS2 STS1 STS0
0 0 0
R/W R/W R/W
Standby timer select 2 to 0
These bits select the
waiting time at exit from
software standby mode
R/W Initial Value
R/W H'0B
3 2 1
UE NMIEG —
1 0 1
R/W R/W —
Reserved bit
NMI edge select
User bit enable
0
RAME
1
R/W
RAM enable