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LM3S8630-IQR50-A2T 데이터시트(PDF) 45 Page - Texas Instruments |
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LM3S8630-IQR50-A2T 데이터시트(HTML) 45 Page - Texas Instruments |
45 / 546 page Therefore, as a multi-shot timer, repeated over and over, it fires every N+1 clock pulse, where N is any value from 1 to 0x00FF.FFFF. So, if the tick interrupt is required every 100 clock pulses, 99 must be written into the RELOAD. If a new value is written on each tick interrupt, so treated as single shot, then the actual count down must be written. For example, if a tick is next required after 400 clock pulses, 400 must be written into the RELOAD. Description Reset Type Name Bit/Field Software should not rely on the value of a reserved bit. To provide compatibility with future products, the value of a reserved bit should be preserved across a read-modify-write operation. 0 RO reserved 31:24 Reload Value to load into the SysTick Current Value Register when the counter reaches 0. - R/W RELOAD 23:0 SysTick Current Value Register Use the SysTick Current Value Register to find the current value in the register. Description Reset Type Name Bit/Field Software should not rely on the value of a reserved bit. To provide compatibility with future products, the value of a reserved bit should be preserved across a read-modify-write operation. 0 RO reserved 31:24 Current Value Current value at the time the register is accessed. No read-modify-write protection is provided, so change with care. This register is write-clear. Writing to it with any value clears the register to 0. Clearing this register also clears the COUNTFLAG bit of the SysTick Control and Status Register. - W1C CURRENT 23:0 SysTick Calibration Value Register The SysTick Calibration Value register is not implemented. 45 April 04, 2010 Texas Instruments-Production Data Stellaris® LM3S8630 Microcontroller |
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