SCG_FIRCCSR field descriptions (continued)
Field
Description
FIRCEN should not toggle when FIRCTREN = 1.
0
Fast IRC is disabled
1
Fast IRC is enabled
18.3.14 Fast IRC Divide Register (SCG_FIRCDIV)
Changes to FIRCDIV should be done when FAST IRC is disabled to prevent glitches to
output divided clock.
Address: 4006_4000h base + 304h offset = 4006_4304h
Bit 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
SCG_FIRCDIV field descriptions
Field
Description
31–19
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
18–16
Reserved
This field is reserved.
This bit field is reserved. Software should write 0 to this bit field to maintain compatibility.
15–11
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
10–8
FIRCDIV2
Fast IRC Clock Divide 2
Clock divider 2 for the Fast IRC. Used by modules that need an asynchronous clock source.
000
Output disabled
001
Divide by 1
010
Divide by 2
011
Divide by 4
100
Divide by 8
101
Divide by 16
110
Divide by 32
111
Divide by 64
7–3
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
FIRCDIV1
Fast IRC Clock Divide 1
Clock divider 1 for Fast IRC. Used to generate the clock source for modules that need an asynchronous
clock source.
000
Output disabled
001
Divide by 1
Table continues on the next page...
Memory Map/Register Definition
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
392
NXP Semiconductors
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