STM32W108HB datasheet(39/179 Pages) STMICROELECTRONICS

Part #	STM32W108HB

Description	High-performance, IEEE 802.15.4 wireless system-on-chip

PDF	179 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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39 / 179 page

STM32W108CB, STM32W108HB

System modules

Doc ID 16252 Rev 2

39/179

Figure 6 shows a block diagram of the clocks in the STM32W108. This simplified view

shows all the clock sources and the general areas of the chip to which they are routed.

Figure 6.

Clocks block diagram

5.3.1

High-frequency internal RC oscillator (OSCHF)

The high-frequency RC oscillator (OSCHF) is used as the default system clock source when

power is applied to the core domain. The nominal frequency coming out of reset is 12 MHz.

Most peripherals, excluding the radio peripheral, are fully functional using the OSCHF clock

source. Application software must be aware that peripherals are clocked at different speeds

depending on whether OSCHF or OSC24M is being used. Since the frequency step of

OSCHF is 0.5 MHz and the high-frequency crystal oscillator is used for calibration, the

calibrated accuracy of OSCHF is +/-250 kHz +/-40 ppm. The UART and ADC peripherals

may not be usable due to the lower accuracy of the OSCHF frequency.

STM32W108HB Datasheet(PDF) 39 Page - STMicroelectronics