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42.2.17 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: 4007_B000h base + 30Ch offset = 4007_B30Ch
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
USB0 Start of Frame (1 kHz)
01
Reserved
10
System OSC
11
Reserved
Memory Map/Register Definition
K32 L2A Reference Manual, Rev. 2, 01/2020
1082
NXP Semiconductors
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