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PM0056 Datasheet(PDF) 152 Page - STMicroelectronics |
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PM0056 Datasheet(HTML) 152 Page - STMicroelectronics |
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152 / 156 page  Core peripherals PM0056 152/156 DocID15491 Rev 5 4.5.2 SysTick reload value register (STK_LOAD) Address offset: 0x04 Reset value: 0x0000 0000 Required privilege: Privileged 31 3029 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 76 54 3 21 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[23:0]: RELOAD value The LOAD register specifies the start value to load into the VAL register 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. The RELOAD value is calculated according to its use: l 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. l To deliver a single SysTick interrupt after a delay of N processor clock cycles, use a RELOAD of value N. For example, if a SysTick interrupt is required after 400 clock pulses, set RELOAD to 400. |
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