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UM10503
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User manual
Rev. 2.1 — 10 December 2015
191 of 1441
NXP Semiconductors
UM10503
Chapter 13: LPC43xx/LPC43Sxx Clock Generation Unit (CGU)
13.6.12 BASE_USB1_CLK control register
These registers control base clocks 3 (USB1).
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
0x0D
IDIVB
0x0E
IDIVC
0x0F
IDIVD
0x10
IDIVE
31:29
-
Reserved
-
-
Table 144. BASE_PERIPH_CLK control register (BASE_PERIPH_CLK, address 0x4005 0064)
bit description
…continued
Bit
Symbol
Value
Description
Reset
value
Access
Table 145. BASE_USB1_CLK control register (BASE_USB1_CLK, address 0x4005 0068) bit
description
Bit
Symbol
Value
Description
Reset
value
Access
0
PD
Output stage power down
0
R/W
0
Enabled. Output stage enabled (default)
1
Power-down
10:1
-
Reserved
-
-
11
AUTOBLOCK
Block clock automatically during frequency
change
0
R/W
0
Disabled. Autoblocking disabled
1
Enabled. Autoblocking enabled
23:12
-
Reserved
-
-