Yes, an external 4~24 MHz high speed crystal (HXT) can be connected to the MS51 series via HXTIN and HXTOUT and be set as system clock source. However, due to the limitation of the pin arrangement, only some of parts in MS51 series support to connect an HXT via HXTIN and HXTOUT. Users can see the table below for reference.

For more details, please refer to the HXT section for crystal and the External Clock Input section for oscillator in MS51 Datasheet.

MS51 Series	Package	Crystal	Oscillator
MS51BA9AE	MSOP10	X	X
MS51DA9AE	TSSOP14	X	X
MS51FC0AE	TSSOP20	V	V
MS51XC0BE	QFN20	V	V
MS51FB9AE	TSSOP20	X	V
MS51XB9AE	QFN20	X	V
MS51EC0AE	TSSOP28	V	V
MS51TC0AE	QFN33	V	V
MS51PC0AE	LQFP32	V	V
MS51EB0AE	TSSOP28	V	V

Products:	Microcontrollers ,8bit 8051 MCUs ,Industrial 8051 Series
Applications:
Function:	Peripherals,Clock Control,HXT,LXT

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Can system clock source be selected from an external crystal (HXT) in MS51 series? Issue Date：2021-11-09

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