UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
117 of 1269
NXP Semiconductors
UM10503
Chapter 11: LPC43xx Clock Generation Unit (CGU)
11.6.8 Integer divider register E
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
0x08
PLL0AUDIO
0x09
PLL1
0x0C
IDIVA
31:29
-
Reserved
-
-
Table 82.
IDIVB/C/D control registers (IDIVB_CTRL, address 0x4005 004C; IDIVC_CTRL,
address 0x4005 0050; IDIVC_CTRL, address 0x4005 0054) bit description
Bit
Symbol
Value
Description
Reset
value
Access
Table 83.
IDIVE control register (IDIVE_CTRL, address 0x4005 0058) bit description
Bit
Symbol
Value
Description
Reset
value
Access
0
PD
Integer divider power down
0
R/W
0
IDIV enabled (default)
1
power-down
1
-
Reserved
-
-
9:2
IDIV
Integer divider E divider values
(1/(IDIV + 1))
00000000 = 1 (default)
00000001 = 2
...
111111111 = 256
000000
00
R/W
10
-
Reserved
-
-
11
AUTOBLOCK
Block clock automatically during frequency
change
0
R/W
0
Autoblocking disabled
1
Autoblocking enabled
23:12
-
Reserved
-
-