STM32F412RG datasheet(101/193 Pages) STMICROELECTRONICS

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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.

tWUSTOP

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

tWUSTOP

Wakeup from STOP mode

code execution on RAM(3)

Main regulator with Flash in

Stop mode or Deep power

down

-4.9

7.0

Wakeup from Stop mode,

regulator in low power mode

and Flash in Stop mode or

Deep power down(2)

12.8

20.0

tWUSTDBY

Wakeup from Standby

mode

316.8

400.0

tWUFLASH

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.

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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