LAPIS Semiconductor ML62Q1000 Series User Manual page 193

Table 4-5 shows the wake-up time (restoring time) from the standby modes.
See Chapter 6 "Clock Generation Circuit" for details of the FHWUPT register.
Function Condition
Low-speed CPU clock
High-speed clock OFF
No CRC calculation
HALT
Low-speed CPU clock
High-speed clock ON
mode
or with CRC
calculation
High-speed CPU clock
No CRC calculation
HALT-H
mode
With CRC calculation
Low-speed CPU clock
STOP
mode
High-speed CPU clock
Low-speed CPU clock
STOP-D
mode
High-speed CPU clock
[Note]
Ÿ
If SYSTEMCLK is switched to high-speed after the STOP/STOP-D mode is released and before the
high-speed clock wake-up time passes, the CPU must wait to run the program because the clock supply
is suspended until the end of the wake-up time.
Ÿ
If peripheral circuits need to work in the HALT-H mode, choose the low-speed clock for the operating
clock.
Ÿ
When the FHWUPT register is set to "0x00", the PLL output clock is masked for approx.2.5 ms. HSCLK
will be supplied after the elapse of 2.5 ms. If HSCLK is selected for SYSTEMCLK, the SYSTEMCLK is
stopped for the time period.
Ÿ
When the FHWUPT register is set to "0x01", the frequency of PLL oscillation clock gradually increases
from approx. 1 MHz after the elapse of the wake-up time chosen by the FHWUPT register and reaches the
target frequency (16 MHz/24 MHz) chosen by the code option before approx. 2 ms elapse. The PLL
oscillation clock during this time period can be used for the SYSTEMCLK, however, accuracy of the
frequency is not guaranteed.
FEUL62Q1000
Table 4-5 Wake-up Time from Standby Mode
Low-speed clock
CPU clock
restoring time (Low-speed RC
[T ]
RTCPU
Approximately
Operation continued
150 μs
Approximately
Operation continued
60 μs
- Operation continued
+ 90 μs
T Operation continued
RTPLL
T Operation continued
RTPLL
Approximately 320 μs
T
RTLS
Approximately 320 μs
T
RTPLL
Approximately 320 μs
T
RTLS
Approximately 320 μs
T
RTPLL
Chapter 4 Power Management
High-speed clock restoring time (PLL
restoring time
oscillation)
FHWUPT=0x01
[T ]
RTLS
Approximately
Approximately
Approximately
Approximately
Approximately
Approximately
ML62Q1000 Series User's Manual
oscillation)
[T ]
RTPLL
FHWUPT=0x00
Stopped
Operation continued
Operation continued
60 μs
60 μs
305 μs
Approx. 2.5 ms
305 μs
305 μs
305 μs
4-27