Datasheet

DocID028087 Rev 4 101/193
STM32F412xE/G Electrical characteristics
161
6.3.8 External clock source characteristics
High-speed external user clock generated from an external source
In bypass mode the HSE oscillator is switched off and the input pin is a standard I/O. The
external clock signal has to respect the Table 56. However, the recommended clock input
waveform is shown in Figure 27.
The characteristics given in Table 38 result from tests performed using an high-speed
external clock source, and under ambient temperature and supply voltage conditions
summarized in Table 15.
t
WUSTOP
Wakeup from STOP mode
Code execution on Flash
Main regulator - 12.9 15.0
µs
Main regulator, Flash
memory in Deep power
down mode
- 104.9 120.0
Wakeup from Stop mode,
regulator in low power
mode
(2)
- 20.8 28.0
Regulator in low power
mode, Flash memory in
Deep power down mode
(2)
- 112.9 130.0
t
WUSTOP
Wakeup from STOP mode
code execution on RAM
(3)
Main regulator with Flash in
Stop mode or Deep power
down
-4.97.0
Wakeup from Stop mode,
regulator in low power mode
and Flash in Stop mode or
Deep power down
(2)
- 12.8 20.0
t
WUSTDBY
Wakeup from Standby
mode
- - 316.8 400.0
t
WUFLASH
Wakeup of Flash
From Flash_Stop mode - 11.0
From Flash Deep power
down mode
- 50.0
1. Guaranteed by characterization, not tested in production.
2. The specification is valid for wakeup from regulator in low power mode or low power low voltage mode, since the timing
difference is negligible.
3. For the faster wakeup time for code execution on RAM, the Flash must be in STOP or DeepPower Down mode (see
reference manual RM0402).
Table 37. Low-power mode wakeup timings
(1)
(continued)
Symbol Parameter Conditions
Min
(1)
Typ
(1)
Max
(1)
Unit
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