528
SYSCR—System Control Register
H'EE012
System control
Bit
Initial value
Read/Write
0
R/W
7
SSBY
0
R/W
6
STS2
0
R/W
5
STS1
0
R/W
4
STS0
1
R/W
3
UE
0
R/W
2
NMIEG
0
R/W
1
SSOE
1
R/W
0
RAME
NMI edge select
0
1
An interrupt is requested at the falling edge of NMI
An interrupt is requested at the rising edge of NMI
RAM enable
0
1
On-chip RAM is disabled
On-chip RAM is enabled
User bit enable
0
1
CCR bit 6 (UI) is used as an interrupt mask bit
CCR bit 6 (UI) is used as a user bit
Standby timer select 2 to 0
Bit 6
STS2
Waiting Time = 8,192 states
Waiting Time = 16,384 states
Waiting Time = 32,768 states
Waiting Time = 65,536 states
Waiting Time = 131,072 states
Waiting Time = 26,2144 states
Waiting Time = 1,024 states
Illegal setting
Bit 5
STS1
Bit 4
STS0
Standby Timer
0
1
0
1
0
1
0
1
0
1
0
1
0
1
Software standby
0
1
SLEEP instruction causes transition to sleep mode
SLEEP instruction causes transition to software standby mode
Software standby output port enable
0
1
In software standby mode,
all address bus and bus
control signals are high-
impedance
In software standby mode,
address bus retains output
state and bus control
signals are fixed high
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