Datasheet

LPC11U6x All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 1.2 — 26 May 2014 36 of 96
NXP Semiconductors
LPC11U6x
32-bit ARM Cortex-M0+ microcontroller
8.25 Clocking and power control
8.25.1 Clock generation
Fig 10. Clock generation
system
oscillator
watchdog oscillator
IRC oscillator
IRC
USB PLL
USBPLLCLKSEL
(USB clock select)
SYSTEM CLOCK
DIVIDER
SYSAHBCLKCTRL
(AHB clock enable)
CPU,
system control,
PMU
memories,
peripheral clocks
SSP0 PERIPHERAL
CLOCK DIVIDER
SSP0
SSP1 PERIPHERAL
CLOCK DIVIDER
SSP1
USART0 PERIPHERAL
CLOCK DIVIDER
USART0
WDT
WDCLKSEL
(WDT clock select)
CLKOUTSEL
(CLKOUT clock select)
USB 48 MHz CLOCK
DIVIDER
USB
watchdog oscillator
IRC oscillator
system oscillator
USBCLKSEL
(USB clock select)
CLKOUT PIN CLOCK
DIVIDER
CLKOUT pin
RTC
oscillator,
32 kHz
output
RTCOSCCTRL
(RTC osc enable)
system clock
SYSTEM PLL
IRC
system
oscillator
watchdog oscillator
MAINCLKSEL
(main clock select)
SYSPLLCLKSEL
(system PLL clock select)
main
clock
IRC
n
CLOCK DIVIDER
FRGCLKDIV
USART1
USART2
USART3
USART4
IOCONCLKDIV
CLOCK DIVIDER
IOCON
glitch filter
7
FRACTIONAL RATE
GENERATOR
aaa-010817