Cypress FM4 Series - High-Speed CR Oscillation Frequency Trimming Register (MCR_FTRM)

CHAPTER 2-3: High-Speed CR Trimming
126 FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E
5.2 High-speed CR Oscillation Frequency Trimming Register (MCR_FTRM)
The MCR_FTRM register sets the frequency trimming value.
Register configuration
bit
31
16
Field
Reserved
Attribute
-
Initial value
-
bit
15
10
9
8
7
6
5
4
3
2
1
0
Field
Reserved
TRD[9:0]
Attribute
-
R/W
Initial value
-
0111101111
Register functions
[bit31:10] Reserved : Reserved bits
"0" is always read from these bits.
These bits have no effect when written.
[bit9:0] TRD[9:0] : Frequency trimming setup bits
bit9:5
Description
When write
These bits make coarse adjustment to the high-speed CR oscillator frequency.
For values to be set, see trimming data acquisition in the operation explanation of the
frequency trimming function.
These bits fluctuate in frequency steps of approximately2.3% each time ±1 setting is made.
When read
A specified value is read.
As an initial value, "0b01111" is read.
bit4:0
Description
When write
These bits make fine adjustment to the high-speed CR oscillator frequency.
For values to be set, see trimming data acquisition in the operation explanation of the
frequency trimming function.
These bits fluctuate in frequency steps of approximately 0.14% each time ±1 setting is made.
When read
A specified value is read.
As an initial value, "0b01111" is read.
Notes:
− This register is not initialized by software reset.
− For values to be set to the TRD bits, see trimming data acquisition in the operation explanation of
the frequency trimming function.