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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PM0214 데이터시트(PDF) 232 Page - STMicroelectronics |
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PM0214 데이터시트(HTML) 232 Page - STMicroelectronics |
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232 / 245 page  Core peripherals PM0214 232/245 DocID022708 Rev 4 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: RELOAD value The LOAD register specifies the start value to load into the STK_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 100 clock pulses, set RELOAD to 99. |
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