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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
189 of 1441
NXP Semiconductors
UM10503
Chapter 13: LPC43xx/LPC43Sxx Clock Generation Unit (CGU)
13.6.9 BASE_SAFE_CLK control register
This register controls the BASE_SAFE_CLK to the watchdog oscillator. The only possible
clock source for this base clock is the IRC.
13.6.10 BASE_USB0_CLK control register
This register controls the BASE_USB0_CLK to the High-speed USB0. The only possible
clock source for this base clock is the PLL0USB output.
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 141. IDIVE control register (IDIVE_CTRL, address 0x4005 0058) bit description
Bit
Symbol
Value
Description
Reset
value
Access
Table 142. BASE_SAFE_CLK control register (BASE_SAFE_CLK, address 0x4005 005C) bit
description
Bit
Symbol
Value
Description
Reset
value
Access
0
PD
Output stage power down
0
R
0
Enabled. Output stage enabled (default)
1
Power-down
10:1
-
Reserved
-
-
11
AUTOBLOCK
Block clock automatically during frequency
change
0
R
0
Disabled. Autoblocking disabled
1
Enabled. Autoblocking enabled
23:12
-
Reserved
-
-
28:24
CLK_SEL
Clock source selection. All other values
are reserved.
0x01
R
0x01
IRC (default)
31:29
-
Reserved
-
-