STM32F030R4T6TR(2013) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

STM32F030R4T6TR
(Rev.:2013)

Value-line ARM®-based 32-bit MCU with up to 256-KB Flash, timers, ADC, communication interfaces, 2.4-3.6 V operation

STMicroelectronics 

STM32F030x4 STM32F030x6 STM32F030x8

Electrical characteristics

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 GPIO.

The external clock signal has to respect the I/O characteristics in Section 6.3.14. However,

the recommended clock input waveform is shown in Figure 13.

Symbol

Table 30. Low-speed external user clock characteristics

Parameter(1)

Conditions

Min

Typ

Max Unit

fLSE_ext

User External clock source

frequency

VLSEH

OSC32_IN input pin high level

voltage

VLSEL

OSC32_IN input pin low level

voltage

tw(LSEH)

tw(LSEL)

OSC32_IN high or low time

tr(LSE)

tf(LSE)

OSC32_IN rise or fall time

1. Guaranteed by design, not tested in production.

-

32.768 1000 kHz

0.7VDD

-

VDD

V

VSS

-

0.3VDD

450

-

-

-

-

ns

50

Figure 13. Low-speed external clock source AC timing diagram

tW(LSEH)

VLSEH

90%

10%

VLSEL

tr(LSE)

tf(LSE)

tW(LSEL)

t

TLSE

MS19215V2

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