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NXP Semiconductors
LPC1111/12/13/14
7.15 Clocking and power control
7.15.1 Crystal oscillators
The LPC1111/12/13/14 include three independent oscillators. These are the system
oscillator, the Internal RC oscillator (IRC), and the Watchdog oscillator. Each oscillator can
be used for more than one purpose as required in a particular application.
Following reset, the LPC1111/12/13/14 will operate from the Internal RC oscillator until
switched by software. This allows systems to operate without any external crystal and the
bootloader code to operate at a known frequency.
See Figure 6 for an overview of the LPC1111/12/13/14 clock generation.
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
MAINCLKSEL
(main clock select)
IRC oscillator
system oscillator
SYSTEM PLL
IRC oscillator
watchdog oscilllator
SYSPLLCLKSEL
watchdog oscillator
(system PLL clock select)
WDTUEN
(WDT clock update enable)
IRC oscillator
system oscillator
watchdog oscillator
CLKOUTUEN
(CLKOUT update enable)
Fig 6.
LPC1111/12/13/14 clocking generation block diagram
UART PERIPHERAL
CLOCK DIVIDER
SPI1 PERIPHERAL
CLOCK DIVIDER
SYSTICK TIMER
CLOCK DIVIDER
WDT CLOCK
DIVIDER
CLKOUT PIN CLOCK
DIVIDER
UART
SPI1
SYSTICK
timer
WDT
CLKOUT pin
002aae514
LPC1111_12_13_14_0
? NXP B.V. 2009. All rights reserved.
Objective data sheet
Rev. 00.11 — 13 November 2009
24 of 53
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