STM8S105K6U3C View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM8S105K6U3C

Access line, 16 MHz STM8S 8-bit MCU, up to 32 Kbytes Flash, integrated EEPROM,10-bit ADC, timers, UART, SPI, I²C

STMicroelectronics 

Electrical characteristics

STM8S105xx

(4) tSU(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 20: HSE oscillator circuit diagram

Rm

Lm CO

Cm

Resonator

CL1

OSCIN

Resonator

CL2

OSCOUT

f HSE to core

RF

gm

Consumption

control

STM8

10.3.4

HSE oscillator critical g m equation

gmcrit= (2 × Π × fHSE)2 × Rm(2Co + C)2

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

Subject to general operating conditions for VDD and TA.

High speed internal RC oscillator (HSI)

Table 34: HSI oscillator characteristics

Symbol Parameter

Conditions

Min

Typ Max Unit

fHSI

Frequency

ACCHSI Accuracy of HSI

oscillator

User-trimmed with

CLK_HSITRIMR register

fcoorngdiivtieonnsV(1D)D and TA

16

MHz

1.0(2) %

78/127

DocID14771 Rev 9

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