STM8S datasheet(80/467 Pages) STMICROELECTRONICS

Part #	STM8S

Description	STM8S Series and STM8AF Series 8-bit microcontrollers

PDF	467 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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80 / 467 page

Clock control (CLK)

RM0016

80/467

DocID14587 Rev 14

9.1

Master clock sources

4 different clock sources can be used to drive the master clock:

•

1-24 MHz high speed external crystal oscillator (HSE)

•

Up to 24 MHz high speed user-external clock (HSE user-ext)

•

16 MHz high speed internal RC oscillator (HSI)

•

128 kHz low speed internal RC (LSI)

Each clock source can be switched on or off independently when it is not used, to optimize

power consumption.

9.1.1

HSE (high-speed external) clock signal

The high speed external clock signal (HSE) can be generated from two possible clock

sources:

•

HSE external crystal/ceramic resonator

•

HSE user external clock

Figure 21. HSE clock sources

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. The

loading capacitance values must be adjusted according to the selected oscillator.

STM8S Datasheet(PDF) 80 Page - STMicroelectronics