18.3.16 Fast IRC Trim Configuration Register (SCG_FIRCTCFG)
The FIRCTCFG register cannot be changed when Fast IRC tuning is enabled. When the
Fast IRC tuning is enabled, writes to this register are ignored, and there is no transfer
error.
Address: 4006_4000h base + 30Ch offset = 4006_430Ch
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
0
0
0
0
0
0
0
0
0
0
0
0
0
SCG_FIRCTCFG field descriptions
Field
Description
31–16
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
15–11
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
10–8
TRIMDIV
Fast IRC Trim Predivide
Divide the System OSC down for Fast IRC trimming.
000
Divide by 1
001
Divide by 128
010
Divide by 256
011
Divide by 512
100
Divide by 1024
101
Divide by 2048
110
Reserved. Writing this value will result in Divide by 1.
111
Reserved. Writing this value will result in a Divide by 1.
7–2
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
TRIMSRC
Trim Source
Configures the external clock source to tune the Fast IRC. TRMSRC must be configured before
programming FIRCSTAT register for trim update
00
Reserved
01
Reserved
10
System OSC
11
Reserved
Memory Map/Register Definition
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
394
NXP Semiconductors
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