STM8AF52AA datasheet(65/110 Pages) STMICROELECTRONICS

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STM8AF52/62xx, STM8AF51/61xx

Electrical characteristics

Doc ID 14395 Rev 9

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10.3.3

External clock sources and timing characteristics

HSE external clock

An HSE clock can be generated by feeding an external clock signal of up to 24 MHz to the

OSCIN pin.

Clock characteristics are subject to general operating conditions for VDD and TA.

Figure 18.

HSE external clock source

HSE crystal/ceramic resonator oscillator

The HSE clock can be supplied using a crystal/ceramic resonator oscillator of up to 24 MHz.

All the information given in this paragraph is based on characterization results with specified

typical external components. In the application, the resonator and the load capacitors have

to be placed as close as possible to the oscillator pins in order to minimize output distortion

and startup stabilization time. Refer to the crystal resonator manufacturer for more details

(frequency, package, accuracy...).

Table 33.

HSE external clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

TA = -40 °C to 150 °C

0(1)

—24

MHz

VHSEdHL

Comparator hysteresis

—

0.1 x VDD

——

VHSEH

OSCIN high-level input pin

voltage

—

0.7 x VDD

—VDD

VHSEL

OSCIN low-level input pin

voltage

—VSS

—

0.3 x VDD

ILEAK_HSE OSCIN input leakage current

VSS < VIN < VDD

-1

—

µA

If CSS is used, the external clock must have a frequency above 500 kHz.

OSCIN

fHSE

External clock

STM8A

source

VHSEL

VHSEH

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