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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
184 of 1441
NXP Semiconductors
UM10503
Chapter 13: LPC43xx/LPC43Sxx Clock Generation Unit (CGU)
switch (psel) {
case 0: return 0xFFFFFFFF;
case 1: return 0x62;
case 2: return 0x42;
default:for (ip = psel; ip <= PLL0_PSEL_MAX; ip++)
x = ((x ^ x>>2) & 1) << 4 | x>>1 & 0x3F;
return x;
} }
13.6.4.5 PLL0AUDIO fractional divider register
When the fractional divider is active, the sigma-delta modulator block generates divider
values M and M+1 in the correct proportion so that an average division ratio of M+K/L is
realized where 0<=K<=L and M, K, and L are integer values. M Is determined by the
integer part of the PLLFRACT_CTRL register (PLLFRACT[21:15]) and K is determined by
the fractional part of the PLLFRACT_CTRL register (PLLFRACT[14:0]). Consecutive M
and M+1 values are then further encoded into appropriate MDEC values before being
presented as input to the M-divider.
13.6.5 PLL1 registers
The PLL1 is used for the core and all peripheral blocks.
13.6.5.1 PLL1 status register
Table 135. PLL0 AUDIO NP-divider register (PLL0AUDIO_NP_DIV, address 0x4005 0038) 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 136. PLL0AUDIO fractional divider register (PLL0AUDIO_FRAC, address 0x4005 003C)
bit description
Bit
Symbol
Description
Reset
value
Access
21:0
PLLFRACT_CTRL
PLL fractional divider control word
000 0000
R/W
31:22
-
Reserved
-
-
Table 137. PLL1 status register (PLL1_STAT, address 0x4005 0040) bit description
Bit
Symbol
Description
Reset
value
Access
0
LOCK
PLL1 lock indicator
0
R
31:1
-
Reserved
-
-