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Zybo > TTC > Prescaler > XTtcPs_SetPrescaler() > 0から16の値

Last updated at Posted at 2016-06-04

http://qiita.com/7of9/items/ace300523ac2521237b7
で気になったPrescalerについて。

    XTtcPs_SetPrescaler(&ttcInst, tmrSetup->Prescaler);

にてtmrSetupでセットしたPrescaler値が使われている。

XTtcPs_SetPrescaler()は以下で実装とコメントが見つかった。

/*****************************************************************************/
/**
*
* This function sets the prescaler enable bit and if needed sets the prescaler
* bits in the control register.
*
* @param	InstancePtr is a pointer to the XTtcPs instance.
* @param	PrescalerValue is a number from 0-16 that sets the prescaler
*		to use.
*		If the parameter is 0 - 15, use a prescaler on the clock of
*		2^(PrescalerValue+1), or 2-65536.
*		If the parameter is XTTCPS_CLK_CNTRL_PS_DISABLE, do not use a
*		prescaler.
*
* @return	None
*
* @note		None
*
****************************************************************************/
void XTtcPs_SetPrescaler(XTtcPs *InstancePtr, u8 PrescalerValue)
{
  • 0から16の値が使える
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