CHAPTER 2-4: Low-Speed CR Prescaler
136 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
Low-speed CR Correction Example
For the correction example of the Low-speed C, see Figure 3-2.
Figure 3-2 Low-speed CR Correction Example
*1: Above is the example by using dual timer. It is possible to measure by using Base timer or MFT.
Set the watch counter prescaler.
Set “Clock Source” to Low-speed CR.
(SEL_IN[1:0] = “11”)
Set the output clock to the value from 2^4 to 2^1.
(SEL_OUT[2:0] = “010”)
Set the division clock to “Enable”.
(CLK_EN = "1")
Set the watch counter. *1
Set the watch counter reload value to 64 division.
(RLC[4:0] = “00000”)
Select WCCK0.
(CS[1:0] = “00”)
Set an interrupt.
(WCIE, WCEN)
Stop dual timer (TimerEn=”0”)
Calculate the Low-speed CR Prescaler Load value from a
measurement count value.
Set the Low-speed CR Prescaler Load Value
Obtain the value of measurement
count from dual timer
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