UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
109 of 1269
NXP Semiconductors
UM10503
Chapter 11: LPC43xx Clock Generation Unit (CGU)
default: for (i = N; i <= N_max; i++)
x = (((x ^ (x>>2) ^ (x>>3) ^ (x>>4)) & 1) << 7) | ((x>>1) & 0x7F); }
NENC[9:0] = x;
•
The valid range for P is from 1 to 2^5. This value is encoded into a 7-bit PDEC value.
The relationship can be expressed through the following pseudo-code:
P_max=0x00000200, x=0x00000010;
switch (P) {
case 0: x = 0xFFFFFFFF;
case 1: x = 0x00000062;
case 2: x = 0x00000042;
default: for (i = P; i <= P_max; i++)
x = (((x ^ (x>>2)) & 1) << 4) | ((x>>1) & 0xF); }
PDEC[6:0] = x;
For specific examples see
and
.
11.6.4 PLL0AUDIO registers
The PLL0AUDIO provides a wide range of frequencies for audio applications and can be
connected to multiple base clocks. The PLL0AUDIO can be used with or without a
fractional divider.
See
for instructions on how to set up the PLL0.
11.6.4.1 PLL0AUDIO status register
Table 73.
PLL0USB NP-divider register (PLL0USB_NP_DIV, address 0x4005 0028) bit
description
Bit
Symbol
Description
Reset
value
Access
6:0
PDEC
Decoded P-divider coefficient value
000 0010
R/W
11:7
-
Reserved
-
-
21:12
NDEC
Decoded N-divider coefficient value
1011 0001
R/W
31:22
-
Reserved
-
-
Table 74.
PLL0AUDIO status register (PLL0AUDIO_STAT, address 0x4005 002C) bit
description
Bit
Symbol
Description
Reset
value
Access
0
LOCK
PLL0 lock indicator
0
R
1
FR
PLL0 free running indicator
0
R
31:2
-
Reserved
-