PM0056 datasheet(152/156 Pages) STMICROELECTRONICS

номер детали	PM0056

подробное описание детали	This programming manual provides information

PDF	156 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

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Core peripherals

PM0056

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DocID15491 Rev 5

4.5.2

SysTick reload value register (STK_LOAD)

Address offset: 0x04

Reset value: 0x0000 0000

Required privilege: Privileged

3029

Reserved

RELOAD[23:16]

RELOAD[15:0]

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:

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.

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.

PM0056 датащи(PDF) 152 Page - STMicroelectronics