UM10503
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
101 of 1269
NXP Semiconductors
UM10503
Chapter 11: LPC43xx Clock Generation Unit (CGU)
11.5 Pin description
11.6 Register description
The register addresses of the CGU are shown in
.
Remark:
The CGU is configured by the boot loader at reset and when waking up from
Deep power-down to produce a 96 MHz clock using PLL1.
Table 66.
CGU pin description
Pin function
Direction
Description
XTAL1
I
Crystal oscillator input
XTAL2
O
Crystal oscillator output
RTCX1
I
RTC 32 kHz oscillator input
RTCX2
O
RTC 32 kHz oscillator output
GP_CLKIN
I
General purpose input clock
ENET_TX_CLK
I
Ethernet PHY transmit clock
ENET_RX_CLK
I
Ethernet PHY receive clock
CLKOUT
O
Clock output pin
CGU_OUT0
O
CGU spare output 0
CGU_OUT1
O
CGU spare output 1
Table 67.
Register overview: CGU (base address 0x4005 0000)
Name
Access Address
offset
Description
Reset
value
Reset
value
after
EMC,
UART0/
3 boot
Reset
value
after
USB0/1
boot
Reference
-
R
0x000
Reserved
-
-
-
-
-
R
0x004
Reserved
-
-
-
-
-
R
0x008
Reserved
-
-
-
-
-
R
0x00C
Reserved
-
-
-
-
-
-
0x010
Reserved
-
-
FREQ_MON
R/W
0x014
Frequency monitor register
0
0
0
XTAL_OSC_CTRL
R/W
0x018
Crystal oscillator control
register
0x0000
0005
0x0100
0000
0 (USB0)
PLL0USB_STAT
R
0x01C
PLL0USB status register
0x0100
0000
0x0100
0000
0x1
(USB0)
PLL0USB_CTRL
R/W
0x020
PLL0USB control register
0x0100
0003
0x0100
0000
0x0600
0818
(USB0)
PLL0USB_MDIV
R/W
0x024
PLL0USB M-divider register
0x05F8
5B6A
0x0100
0000
0x0196
7FFA
(USB0)
PLL0USB_NP_DIV
R/W
0x028
PLL0USB N/P-divider
register
0x000B
1002
0x0100
0000
0x0030
2062
(USB0)