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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
114 of 1269
NXP Semiconductors
UM10503
Chapter 11: LPC43xx Clock Generation Unit (CGU)
6
FBSEL
PLL feedback select (see
).
0
R/W
0
CCO output is used as feedback divider input
clock.
1
PLL output clock (clkout) is used as feedback
divider input clock. Use for normal operation.
7
DIRECT
PLL direct CCO output
0
R/W
0
Disabled
1
Enabled
9:8
PSEL
Post-divider division ratio P. The value applied
is 2xP.
01
R/W
0x0
1
0x1
2 (default)
0x2
4
0x3
8
10
-
Reserved
-
-
11
AUTOBLOCK
Block clock automatically during frequency
change
0
R/W
0
Autoblocking disabled
1
Autoblocking enabled
13:12
NSEL
Pre-divider division ratio N
10
R/W
0x0
1
0x1
2
0x2
3 (default)
0x3
4
15:14
-
Reserved
-
-
23:16
MSEL
Feedback-divider division ratio (M)
00000000 = 1
00000001 = 2
...
11111111 = 256
11000
R/W
Table 80.
PLL1_CTRL register (PLL1_CTRL, address 0x4005 0044) bit description
…continued
Bit
Symbol
Value Description
Reset
value
Access