Datasheet

LPC15XX All information provided in this document is subject to legal disclaimers. © NXP B.V. 2014. All rights reserved.
Product data sheet Rev. 1 — 19 February 2014 44 of 99
NXP Semiconductors
LPC15xx
32-bit ARM Cortex-M3 microcontroller
8.34 Clock generation
Fig 14. Clock generation
system oscillator
watchdog oscillator
IRC
system oscillator
IRC
IRC
USB PLL
USBPLLCLKSEL
(USB PLL clock select)
SYSTEM CLOCK
DIVIDER
SYSAHBCLKCTRLn
(AHB clock enable)
CPU, system control,
PMU
memories,
peripheral clocks
SYSTICK PERIPHERAL
CLOCK DIVIDER
ARM core
SYSTICK
IOCONCLKDIV
CLOCK DIVIDER
IOCON digital
glitch filter
ARM TRACE CLOCK
CLOCK DIVIDER
ARM trace
USART PERIPHERAL
CLOCK DIVIDER
FRACTIONAL RATE
GENERATOR
USART[n:0]
WWDT
CLKOUTSELA
(CLKOUT clock select A)
USB 48 MHz CLOCK
DIVIDER
USB
watchdog oscillator
IRC
system oscillator
USBCLKSEL
(USB clock select)
CLKOUT PIN CLOCK
DIVIDER
CLKOUT pin
system clock
SYSTEM PLL
IRC
system oscillator
watchdog oscillator
MAINCLKSELB
(main clock select B)
MAINCLKSELA
(main clock select A)
SYSPLLCLKSEL
(system PLL clock select)
main clock
IRC
system oscillator
RTC oscillator
n
system oscillator
IRC
SCT PLL
SCTPLLCLKSEL
(SCT PLL clock select)
SCT
ASYNC ADC CLOCK
DIVIDER
ADC
ADCASYNCCLKSEL
(clock select)
32 kHz
RTC oscillator 32 kHz
CLKOUTSELB
(CLKOUT clock select B)
aaa-010875