STM8S207MB datasheet(64/103 Pages) STMICROELECTRONICS

64 / 103 page

Electrical characteristics

STM8S207xx, STM8S208xx

64/103

Doc ID 14733 Rev 12

10.3.3

External clock sources and timing characteristics

HSE user external clock

Subject to general operating conditions for VDD and TA.

Figure 16.

HSE external clock source

HSE crystal/ceramic resonator oscillator

The HSE clock can be supplied with a 1 to 24 MHz crystal/ceramic resonator oscillator. 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 start-up stabilization time. Refer to the crystal resonator manufacturer for more details

(frequency, package, accuracy...).

Table 31.

HSE user external clock characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

fHSE_ext

User external clock source

frequency

024

MHz

VHSEH

(1)

Data based on characterization results, not tested in production.

OSCIN input pin high level

voltage

0.7 x VDD

VDD + 0.3 V

VHSEL

(1)

OSCIN input pin low level

voltage

VSS

0.3 x VDD

ILEAK_HSE

OSCIN input leakage

current

VSS < VIN < VDD

-1

µA

OSCIN

fHSE

External clock

STM8

source

VHSEL

VHSEH

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