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PM0056 датащи(PDF) 151 Page - STMicroelectronics |
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PM0056 датащи(HTML) 151 Page - STMicroelectronics |
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151 / 156 page ![]() DocID15491 Rev 5 151/156 PM0056 Core peripherals 4.5.1 SysTick control and status register (STK_CTRL) Address offset: 0x00 Reset value: 0x0000 0000 Required privilege: Privileged The SysTick CTRL register enables the SysTick features. 31 3029 28 27 26 25 24 23 22 21 20 19 18 17 16 Reserved COUNT FLAG rw 15 14 13 12 11 10 9 8 76 54 3 21 0 Reserved CLKSO URCE TICK INT EN ABLE rw rw rw Bits 31:17 Reserved, must be kept cleared. Bit 16 COUNTFLAG: Returns 1 if timer counted to 0 since last time this was read. Bits 15:3 Reserved, must be kept cleared. Bit 2 CLKSOURCE: Clock source selection Selects the clock source. 0: AHB/8 1: Processor clock (AHB) Bit 1 TICKINT: SysTick exception request enable 0: Counting down to zero does not assert the SysTick exception request 1: Counting down to zero to asserts the SysTick exception request. Note: Software can use COUNTFLAG to determine if SysTick has ever counted to zero. Bit 0 ENABLE: Counter enable Enables the counter. When ENABLE is set to 1, the counter loads the RELOAD value from the LOAD register and then counts down. On reaching 0, it sets the COUNTFLAG to 1 and optionally asserts the SysTick depending on the value of TICKINT. It then loads the RELOAD value again, and begins counting. 0: Counter disabled 1: Counter enabled |
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