STM8S103F2 datasheet(67/117 Pages) STMICROELECTRONICS

67 / 117 page

(1) C is approximately equivalent to 2 x crystal Cload.

(2) The oscillator selection can be optimized in terms of supply current using a high quality resonator with

small Rm value. Refer to crystal manufacturer for more details

(3) Data based on characterization results, not tested in production.

(4) t

SU(HSE) is the start-up time measured from the moment it is enabled (by software) to a stabilized 16

MHz oscillation is reached. This value is measured for a standard crystal resonator and it can vary

significantly with the crystal manufacturer.

Figure 19: HSE oscillator circuit diagram

OSCOUT

OSCIN

f HSE to core

CL1

CL2

STM8

Resonator

Consumption

control

Resonator

HSE oscillator critical g m equation

gmcrit= (2 × Π × fHSE)

2 × R

m(2Co + C)

Rm: Notional resistance (see crystal specification)

Lm: Notional inductance (see crystal specification)

Cm: Notional capacitance (see crystal specification)

Co: Shunt capacitance (see crystal specification)

CL1= CL2 = C: Grounded external capacitance

gm >> gmcrit

Internal clock sources and timing characteristics

10.3.4

Subject to general operating conditions for VDD and TA.

High speed internal RC oscillator (HSI)

Table 34: HSI oscillator characteristics

Unit

Max

Typ

Min

Conditions

Parameter

Symbol

MHz

Frequency

fHSI

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Electrical characteristics

STM8S103K3 STM8S103F3 STM8S103F2

STM8S103F2 Datasheet(PDF) 67 Page - STMicroelectronics

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