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PM0215 数据表(PDF) 87 Page - STMicroelectronics |
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PM0215 数据表(HTML) 87 Page - STMicroelectronics |
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87 / 91 page  PM0215 Core peripherals Doc ID 022979 Rev 1 87/91 4.4.2 SysTick reload value register (STK_RVR) Address offset: 0x04 Reset value: Unknown The STK_RVR specifies the start value to load into the STK_CVR. 4.4.3 SysTick current value register (STK_CVR) Address offset: 0x08 Reset value: Unknown The STK_CVR contains the current value of the SysTick counter. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Reserved RELOAD[23:16] rw rw rw rw rw rw rw rw 15 14 13 12 11 10 9 8 7 6 5 4321 0 RELOAD[15:0] rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw Bits 31:24 Reserved, must be kept cleared. Bits 23:0 RELOAD: RELOAD value Value to load into the STK_CVR when the counter is enabled and when it reaches 0. Calculating the RELOAD value The RELOAD value can be any value in the range 0x00000001-0x00FFFFFF. A start value of 0 is possible, but has no effect because the SysTick exception request and COUNTFLAG are activated when counting from 1 to 0. To generate a multi-shot timer with a period of N processor clock cycles, use a RELOAD value of N-1. For example, if the SysTick interrupt is required every 100 clock pulses, set RELOAD to 99. 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 Reserved CURRENT[23:16] rw rw rw rw rw rw rw rw 15 14 13 12 11 10 9 8 7 6 5 4321 0 CURRENT[15:0] rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw Bits 31:24 Reserved, must be kept cleared. Bits 23:0 CURRENT: Current counter value Reads return the current value of the SysTick counter. A write of any value clears the field to 0, and also clears the COUNTFLAG bit in the STK_CSR register to 0. |
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