HD6433935 Hitachi, HD6433935 Datasheet - Page 110

• Manufacturer Part Number: HD6433935
• Description: 8-Bit MICROCONTROLLER
• Manufacturer: Hitachi

5.1.1
The operation mode is selected using the system control registers described in table 5-3.
Table 5-3
Name
System control register 1
System control register 2
1. 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
98
Bit
Initial value
Read/Write
System Control Registers
System Control Registers
Description
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
SSBY
R/W
7
0
STS2
R/W
6
0
Abbreviation
SYSCR1
SYSCR2
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'F0
—
—
2
1
MA1
R/W
1
1
Address
H'FFF0
H'FFF1
(initial value)
MA0
R/W
0
1