LPC1313 datasheet(22/53 Pages) NXP

22 / 53 page

LPC1311_13_42_43_1

Product data sheet

Rev. 01 — 11 December 2009

22 of 53

NXP Semiconductors

LPC1311/13/42/43

32-bit ARM Cortex-M3 microcontroller

7.17.1.1

Internal RC oscillator

The IRC may be used as the clock source for the WDT, and/or as the clock that drives the

system 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.

The USB clock is available on LPC1342/43 only.

Fig 7.

LPC1311/13/42/43 clocking generation block diagram

SYSTEM PLL

IRC oscillator

system oscillator

watchdog oscilllator

watchdog oscillator

IRC oscillator

watchdog oscillator

USB PLL

MAINCLKSEL

(main clock select)

SYSPLLCLKSEL

(system PLL clock select)

USBPLLCLKSEL

(USB clock select)

SYSTEM CLOCK

DIVIDER

AHBCLKCTRL

(AHB clock enable)

AHB clock 0

(system)

AHB clock 1

(ROM)

AHB clock 16

(IOCONFIG)

AHBCLKCTRL

SSP PERIPHERAL

CLOCK DIVIDER

SSP

UART PERIPHERAL

CLOCK DIVIDER

UART

SYSTICK TIMER

CLOCK DIVIDER

WDT CLOCK

DIVIDER

SYSTICK

timer

ARM TRACE

CLOCK DIVIDER

ARM

trace clock

WDT

WDTUEN

(WDT clock update enable)

USB 48 MHz CLOCK

DIVIDER

USB

USBUEN

(USB clock update enable)

watchdog oscillator

IRC oscillator

system oscillator

CLKOUT PIN CLOCK

DIVIDER

CLKOUT pin

CLKOUTUEN

(CLKOUT update enable)

002aae859

main clock

system clock

IRC oscillator

AHB clocks

2 to 15

(memories

and peripherals)

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