STM32F412RGT6P datasheet(108/201 Pages) STMICROELECTRONICS

部件名	STM32F412RGT6P

功能描述	Arm®-Cortex®-M4 32b MCUFPU, 125 DMIPS, 1MB Flash, 256KB RAM, USB OTG FS, 17 TIMs, 1 ADC, 17 comm. interfaces

PDF	201 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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108 / 201 page

Electrical characteristics

STM32F412xE/G

108/201

DocID028087 Rev 7

Low-speed external user clock generated from an external source

In bypass mode the LSE oscillator is switched off and the input pin is a standard I/O. The

external clock signal has to respect the Table 57. However, the recommended clock input

waveform is shown in Figure 28.

The characteristics given in Table 40 result from tests performed using an low-speed

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

summarized in Table 16.

Figure 27. High-speed external clock source AC timing diagram

Table 40. Low-speed external user clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fLSE_ext

User External clock source

frequency(1)

32.768

1000

kHz

VLSEH

OSC32_IN input pin high level

voltage

0.7VDD

-VDD

VLSEL

OSC32_IN input pin low level voltage

VSS

-0.3VDD

tw(LSE)

tf(LSE)

OSC32_IN high or low time(1)

450

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time(1)

Cin(LSE)

OSC32_IN input capacitance(1)

-5

DuCy(LSE) Duty cycle

OSC32_IN Input leakage current

VSS ≤ VIN ≤ VDD

±1

µA

1. Guaranteed by design, not tested in production.

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