HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 101

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

Table 5.3
Name
System control register 1
System control register 2
System Control Register 1 (SYSCR1)
SYSCR1 is an 8-bit read/write register for control of the power-down modes.
Upon reset, SYSCR1 is initialized to H'07.
Bit 7—Software Standby (SSBY): This bit designates transition to standby mode or watch mode.
Bit 7: SSBY
0
1
92
Bit
Initial value
Read/Write
System Control Registers
SSBY
R/W
Description
7
0
When a SLEEP instruction is executed in active mode, a transition is made
to sleep mode
When a SLEEP instruction is executed in subactive mode, a transition is
made to subsleep mode
When a SLEEP instruction is executed in active mode, a transition is made
to standby mode or watch mode
When a SLEEP instruction is executed in subactive mode, a transition is
made to watch mode
STS2
R/W
Abbreviation
SYSCR1
SYSCR2
6
0
STS1
R/W
5
0
STS0
R/W
4
0
R/W
R/W
R/W
LSON
R/W
3
0
Initial Value
H'07
H'E0
—
—
2
1
MA1
R/W
Address
H'FFF0
H'FFF1
1
1
(initial value)
MA0
R/W
0
1