
19.3.18 Fast IRC Status Register (SCG_FIRCSTAT)
This register is loaded from IFR during reset. These register gets uploaded with the trim
values generated by FIRC auto trimming which is enabled when FIRC is enabled and
FIRCTREN=1 and FIRCTRUP=1. When FIRC auto trimming is enabled and FIRCTRUP
is off (Note: TRIMSRC needs to be programmed to TRIMSRC=10 or TRIMSRC=11),
writes to this register is allowed and values written to this register are used to trim FIRC
clock.
Address: 4006_4000h base + 318h offset = 4006_4318h
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
R
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
R
W
Reset
0
0
0
* Notes:
TRIMCOAR field: Reset values are loaded out of IFR.
•
TRIMFINE field: Reset values are loaded out of IFR.
•
SCG_FIRCSTAT field descriptions
Field
Description
31–16
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
15–14
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
13–8
TRIMCOAR
Trim Coarse
TRIMCOAR bits are used to coursely trim the Fast IRC Clock to within approximately ±0.7% of the target
frequency. When FIRC is enabled and auto trimming is enabled (FIRCTREN=1 and FIRCTRUP=1), then
TRIMCOAR register gets uploaded with the trimmed coarse value. When FIRCTRUP=0, TRIMCOAR
bitfield is writable, to allow user programming of coarse trim values.
7
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
TRIMFINE
Trim Fine Status
Once the Fast IRC Clock is trimmed to ±0.7% of the target frequency using the TRIMCOAR bits, the
TRIMFINE bits can be used to trim the Fast IRC Clock to within ±0.04% of the target frequency. When
FIRC is enabled and auto trimming is enabled (FIRCTREN=1 and FIRCTRUP=1), TRIMFINE register gets
uploaded with the trimmed fine value. When FIRCTRUP=0, TRIMFINE bitfield is writeable, to allow user
programming of fine trim values.
Chapter 19 System Clock Generator (SCG)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
475
Summary of Contents for KE1xF Series
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