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

3.3 System Control Register (SYSCR)

SYSCR is an 8-bit register that controls the operation of the H8/3035 Series.
Bit 7
SSBY
Initial value 0
Read/Write R/W
Software standby
Enables transition to software standby mode
Bit 7—Software Standby (SSBY): Enables transition to software standby mode. (For further
information about software standby mode see section 16, 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 Description
0 SLEEP instruction causes transition to sleep mode
1 SLEEP instruction causes transition to software standby mode
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
recovery from software standby mode
3 2
UE NMIEG
1 0
R/W R/W
Reserved bit
NMI edge select
Selects the valid edge
of the NMI input
User bit enable
Selects whether to use UI bit in CCR
as a user bit or an interrupt mask bit
1 0
— RAME
1 1
— R/W
RAM enable
Enables or
disables
on-chip RAM
(Initial value)
55