STM32F479AI datasheet(110/208 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32F479xx

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5.3.8

Wakeup time from low-power modes

The wakeup times given in Table 34 are measured starting from the wakeup event trigger up

to the first instruction executed by the CPU:

•

For Stop or Sleep modes: the wakeup event is WFE.

•

WKUP (PA0) pin is used to wakeup from Standby, Stop and Sleep modes.

All timings are derived from tests performed under ambient temperature and VDD=3.3 V.

5.3.9

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 58. However, the recommended clock input

waveform is shown in Figure 27.

The characteristics given in Table 35 result from tests performed using an high-speed

external clock source, and under ambient temperature and supply voltage conditions

Table 34. Low-power mode wakeup timings

Symbol

Parameter

Conditions

Typ(1) Max(1)

Unit

tWUSLEEP(2)

Wakeup from Sleep

CPU clock

cycles

tWUSTOP(2)

Wakeup from Stop mode

with MR/LP regulator in

normal mode

Main regulator is ON

12.9

13.0

µs

Main regulator is ON and Flash

memory in Deep power down mode

105

109

Low power regulator is ON

25.4

Low power regulator is ON and Flash

memory in Deep power down mode

114

121

tWUSTOP(2)

Wakeup from Stop mode

with MR/LP regulator in

Under-drive mode

Main regulator in under-drive mode

(Flash memory in Deep power-down

mode)

107

111

Low power regulator in under-drive

mode (Flash memory in Deep

power-down mode)

115

121

tWUSTDBY (2)(3) Wakeup from Standby mode

318

371

1. Based on test during characterization.

2. The wakeup times are measured from the wakeup event to the point in which the application code reads the first

3. tWUSTDBY maximum value is given at –40 °C.

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