hd64338023s Renesas Electronics Corporation., hd64338023s Datasheet - Page 164

• Manufacturer Part Number: hd64338023s
• Description: Renesas 8-bit Single-chip Microcomputer Super Low Power Series
• Manufacturer: Renesas Electronics Corporation.

Section 5 Power-Down Modes
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
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
Rev. 7.00 Mar 10, 2005 page 122 of 652
REJ09B0042-0700
Bit
Initial value
Read/Write
11. On the H8/38124 Group, operates only when the on-chip oscillator is selected; otherwise stops and stands by. On
the H8/38024, H8/38024S, and H8/38024R Group, stops and stands by.
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
STS1
R/W
Abbreviation
SYSCR1
SYSCR2
5
0
STS0
R/W
4
0
LSON
R/W
R/W
R/W
R/W
3
0
Initial Value
H'07
H'F0


2
1
MA1
R/W
1
1
(initial value)
Address
H'FFF1
H'FFF0
MA0
R/W
0
1