LPC1111FDH20SLASH002 datasheet(53/127 Pages) NXP

53 / 127 page

LPC111X

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Product data sheet

Rev. 9.2 — 26 March 2014

53 of 127

NXP Semiconductors

LPC1110/11/12/13/14/15

32-bit ARM Cortex-M0 microcontroller

Following reset, the LPC1110/11/12/13/14/15 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 16 for an overview of the LPC1110/11/12/13/14/15 clock generation.

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 LPC1110/11/12/13/14/15 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.

Fig 16. LPC1110/11/12/13/14/15 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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