HD64F2149 Datasheet, PDF (750/1035 Pages) Renesas Technology Corp – Hitachi 16-Bit Single-Chip Microcomputer

Bit 7
SSBY
0
1
Description
Transition to sleep mode after execution of SLEEP instruction in
high-speed mode or medium-speed mode
(Initial value)
Transition to subsleep mode after execution of SLEEP instruction
in subactive mode
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
Bits 6 to 4—Standby Timer Select 2 to 0 (STS2 to STS0): These bits select the time the MCU
waits for the clock to stabilize when software standby mode, watch mode, or subactive mode is
cleared and a transition is made to high-speed mode or medium-speed mode by means of a
specific interrupt or instruction. With crystal oscillation, refer to table 24.4 and make a selection
according to the operating frequency so that the standby time is at least 8 ms (the oscillation
settling time). With an external clock, any selection can be made.
Bit 6 Bit 5 Bit 4
STS2 STS1 STS0 Description
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.
(Initial value)
Bit 3—Reserved: This bit cannot be modified and is always read as 0.
716