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42.2.6 HSRUN Clock Control Register (SCG_HCCR)
This register controls the system clock source and the system clock dividers for the core,
platform, external and bus clock domains when in HSRUN mode only. This register can
only be written using a 32-bit write. Selecting a different clock source when in HSRUN
requires that clock source to be enabled first and be valid before system clocks switch to
that clock source. If system clock divide ratios also change when selecting a different
clock mode when in HSRUN, new system clock divide ratios will not take affect until
new clock source is valid.
Address: 4007_B000h base + 1Ch offset = 4007_B01Ch
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 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1
SCG_HCCR field descriptions
Field
Description
31–28
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
27–24
SCS
System Clock Source
Selects the clock source generating the system clock in HSRUN mode. Attempting to select a clock that is
not valid will be ignored. Selecting a different clock source when in HSRUN mode will enable that clock
source and switch to that clock mode when it is valid.
0000
Reserved
0001
System OSC (SOSC_CLK)
0010
Slow IRC (SIRC_CLK)
0011
Fast IRC (FIRC_CLK)
0100
Reserved
0101
Reserved
0110
System PLL (SPLL_CLK)
0111
Reserved
23–20
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
19–16
DIVCORE
Core Clock Divide Ratio
0000
Divide-by-1
0001
Divide-by-2
0010
Divide-by-3
0011
Divide-by-4
0100
Divide-by-5
0101
Divide-by-6
0110
Divide-by-7
0111
Divide-by-8
Table continues on the next page...
Memory Map/Register Definition
K32 L2A Reference Manual, Rev. 2, 01/2020
1066
NXP Semiconductors
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