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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
107 of 1269
NXP Semiconductors
UM10503
Chapter 11: LPC43xx Clock Generation Unit (CGU)
11.6.3.3 PLL0USB M-divider register
Remark:
The PLL M-divider register does not use the direct binary representations of M
directly. Instead, it uses an encoded version MDEC of M. The valid range for M is 1 to
2^15. This value is encoded into a 17-bit MDEC value.
The relationship between M and MDEC is expressed via the following pseudo-code. For
specific examples see
and
.
M_max=0x00008000, x=0x00004000;
switch (M) {
case 0: x = 0xFFFFFFFF;
3
DIRECTO
PLL0 direct output
0
R/W
4
CLKEN
PLL0 clock enable
0
R/W
5
-
Reserved
-
-
6
FRM
Free running mode
0
R/W
7
-
Reserved
0
R/W
8
-
Reserved. Reads as zero. Do not write
one to this register.
0
R/W
9
-
Reserved. Reads as zero. Do not write
one to this register.
0
R/W
10
-
Reserved. Reads as zero. Do not write
one to this register.
0
R/W
11
AUTOBLOCK
Block clock automatically during frequency
change
0
R/W
0
Autoblocking disabled
1
Autoblocking enabled
23:12
-
Reserved
-
-
28:24
CLK_SEL
Clock source selection. All other values
are reserved.
0x01
R/W
0x00
32 kHz oscillator
0x01
IRC (default)
0x02
ENET_RX_CLK
0x03
ENET_TX_CLK
0x04
GP_CLKIN
0x06
Crystal oscillator
0x09
PLL1
0x0C
IDIVA
0x0D
IDIVB
0x0E
IDIVC
0x0F
IDIVD
0x10
IDIVE
31:29
-
Reserved
-
-
Table 71.
PLL0USB control register (PLL0USB_CTRL, address 0x4005 0020) bit description
…continued
Bit
Symbol
Value
Description
Reset
value
Access