LPC1111 datasheet(22/64 Pages) NXP

22 / 64 page

LPC1111_12_13_14

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Product data sheet

Rev. 5 — 22 June 2011

22 of 64

NXP Semiconductors

LPC1111/12/13/14

32-bit ARM Cortex-M0 microcontroller

7.16.1.1

Internal RC oscillator

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 LPC1111/12/13/14 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.

Fig 5.

LPC1111/12/13/14 clock generation block diagram

SYSTEM PLL

IRC oscillator

system oscillator

watchdog oscillator

IRC oscillator

watchdog oscillator

MAINCLKSEL

(main clock select)

SYSPLLCLKSEL

(system PLL clock select)

SYSTEM CLOCK

DIVIDER

AHB clock 0

(system)

SYSAHBCLKCTRL[1:18]

(AHB clock enable)

AHB clocks 1 to 18

(memories

and peripherals)

SPI0 PERIPHERAL

CLOCK DIVIDER

SPI0

SPI1 PERIPHERAL

CLOCK DIVIDER

SPI1

UART PERIPHERAL

CLOCK DIVIDER

UART

WDT CLOCK

DIVIDER

WDT

WDTUEN

(WDT clock update enable)

watchdog oscillator

IRC oscillator

system oscillator

CLKOUT PIN CLOCK

DIVIDER

CLKOUT pin

CLKOUTUEN

(CLKOUT update enable)

002aae514

main clock

system clock

IRC oscillator

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