NXP Semiconductors
LPC11C12/C14
AHB clock 0
SYSTEM CLOCK
DIVIDER
system clock
18
AHBCLKCTRL[1:18]
(AHB clock enable)
(system)
AHB clocks 1 to 18
(memories
and peripherals)
IRC oscillator
main clock
SPI0 PERIPHERAL
CLOCK DIVIDER
SPI0
watchdog oscillator
IRC oscillator
system oscillator
SYSPLLCLKSEL
(system PLL clock select)
MAINCLKSEL
(main clock select)
SYSTEM PLL
IRC oscillator
watchdog oscillator
WDTUEN
(WDT clock update enable)
IRC oscillator
UART PERIPHERAL
CLOCK DIVIDER
SPI1 PERIPHERAL
CLOCK DIVIDER
WDT CLOCK
DIVIDER
UART
SPI1
WDT
Fig 4.
system oscillator
watchdog oscillator
CLKOUTUEN
(CLKOUT update enable)
LPC11C12/C14 clock generation block diagram
7.16.1.1
Internal RC oscillator
CLKOUT PIN CLOCK
DIVIDER
CLKOUT pin
002aae514
The IRC may be used as the clock source for the WDT, and/or as the clock that drives the
PLL and subsequently the CPU. The nominal IRC frequency is 12 MHz. The IRC is
trimmed to 1 % accuracy over the entire voltage and temperature range.
Upon power-up or any chip reset, the LPC11C12/C14 use the IRC as the clock source.
Software may later switch to one of the other available clock sources.
7.16.1.2
System oscillator
The system oscillator can be used as the clock source for the CPU, with or without using
the PLL.
The system oscillator operates at frequencies of 1 MHz to 25 MHz. This frequency can be
boosted to a higher frequency, up to the maximum CPU operating frequency, by the
system PLL.
LPC11C12_C14_0
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 00.05 — 23 April 2010
? NXP B.V. 2010. All rights reserved.
16 of 49
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