HD64F2149 Datasheet, PDF (922/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

SBYCR—Standby Control Register
Bit
Initial value
Read/Write
7
SSBY
0
R/W
6
STS2
0
R/W
5
STS1
0
R/W
4
STS0
0
R/W
H'FF84
3
2
—
SCK2
0
0
—
R/W
1
SCK1
0
R/W
System
0
SCK0
0
R/W
System clock select 2 to 0
0
0
0 Bus master is in high-speed mode
1 Medium-speed clock = ø/2
1
0 Medium-speed clock = ø/4
1 Medium-speed clock = ø/8
1
0
0 Medium-speed clock = ø/16
1 Medium-speed clock = ø/32
1
——
Standby timer select 2 to 0
0
0
0 Standby time = 8192 states
1 Standby time = 16384 states
1
0 Standby time = 32768 states
1 Standby time = 65536 states
1
0
0 Standby time = 131072 states
1 Standby time = 262144 states
1
0 Reserved
1 Standby time = 16 states*
Note: * This setting must not be used in the flash memory version.
Software standby
0 Transition to sleep mode after execution of SLEEP instruction in high-speed mode
or medium-speed mode
Transition to subsleep mode on execution of SLEEP instruction in subactive mode
1 Transition to software standby mode, subactive mode, or watch mode after execution
of SLEEP instruction in high-speed mode or medium-speed mode
Transition to watch mode or high-speed mode after execution of SLEEP instruction in
subactive mode
888