SYST_CSR

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Interpret as SYST_CSR

Use the SysTick Control and Status Register to enable the SysTick features.

ENABLE	Enable SysTick counter: 0 = Counter disabled. 1 = Counter enabled.
TICKINT	Enables SysTick exception request: 0 = Counting down to zero does not assert the SysTick exception request. 1 = Counting down to zero to asserts the SysTick exception request.
CLKSOURCE	SysTick clock source. Always reads as one if SYST_CALIB reports NOREF. Selects the SysTick timer clock source: 0 = External reference clock. 1 = Processor clock.
COUNTFLAG	Returns 1 if timer counted to 0 since last time this was read. Clears on read by application or debugger.

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