CHAPTER 2-3: High-Speed CR Trimming
114 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
1. High-Speed CR Trimming Function Overview
This section explains frequency trimming function of the high-speed CR oscillator.
The high-speed CR oscillators used for this device have fluctuation range in frequency accuracy due to
process variation. The fluctuation range of frequency accuracy due to process variation and temperature
change can be reduced by configuring the trimming function.
The high-speed CR trimming function consists of the frequency trimming setup unit and temperature
trimming setup unit.
The frequency trimming setup unit has the following functions:
− It can be configured the high-speed CR frequency trimming by writing a trimming value to the
High-speed CR oscillation Frequency Trimming Register (MCR_FTRM).
− By using ch.0 of Base Timer, the setting value to the frequency trimming register can be calculated
from count value of the specified period.
The temperature trimming setup unit has the following function:
It can be configured the high-speed CR temperature compensation by writing a trimming value to
the High-speed CR oscillation Temperature Trimming Register (MCR_TTRM).
For the high-speed CR frequency accuracy, see electrical characteristics described in "Data Sheet" of the
product used.
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