HD6433045 HITACHI [Hitachi Semiconductor], HD6433045 Datasheet - Page 73

• Manufacturer Part Number: HD6433045
• Description: Hitachi Single-Chip Microcomputer
• Manufacturer: HITACHI [Hitachi Semiconductor]

3.3 System Control Register (SYSCR)
SYSCR is an 8-bit register that controls the operation of the H8/3048 Series.
Bit 7—Software Standby (SSBY): Enables transition to software standby mode. (For further
information about software standby mode see section 20, Power-Down State.)
When software standby mode is exited by an external interrupt, this bit remains set to 1. To clear
this bit, write 0.
Bit 7
SSBY
0
1
Bit
Initial value
Read/Write
Description
SLEEP instruction causes transition to sleep mode
SLEEP instruction causes transition to software standby mode
SSBY
Software standby
Enables transition to software standby mode
R/W
7
0
STS2
R/W
Standby timer select 2 to 0
These bits select the waiting time at
recovery from software standby mode
6
0
STS1
R/W
5
0
58
STS0
R/W
4
0
User bit enable
Selects whether to use the UI bit in CCR
as a user bit or an interrupt mask bit
R/W
UE
3
1
NMI edge select
Selects the valid edge
of the NMI input
NMIEG
R/W
2
0
Reserved bit
—
—
1
1
RAM enable
Enables or
disables
on-chip RAM
(Initial value)
RAME
R/W
0
1