LPC1343FHN33 NXP Semiconductors, LPC1343FHN33 Datasheet - Page 25

• Manufacturer Part Number: LPC1343FHN33
• Description: The LPC1343FHN33 is a ARM Cortex-M3 based microcontroller for embedded applications featuring a high level of integration and low power consumption
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC1311_13_42_43
Product data sheet
Fig 7.
watchdog oscillator
system oscillator
system oscillator
IRC oscillator
IRC oscillator
The USB clock is available on LPC1342/43 only. SSP1 is available on LPC1313FBD48/01 only.
LPC1311/13/42/43 clocking generation block diagram
(system PLL clock select)
7.18.1.1 Internal RC oscillator
(USB clock select)
USBPLLCLKSEL
SYSPLLCLKSEL
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.
SYSTEM PLL
(main clock select)
USB PLL
MAINCLKSEL
All information provided in this document is subject to legal disclaimers.
main clock
Rev. 4 — 20 June 2011
watchdog oscillator
watchdog oscillator
system oscillator
SYSTEM CLOCK
IRC oscillator
IRC oscillator
DIVIDER
(WDT clock update enable)
(USB clock update enable)
(CLKOUT update enable)
CLKOUTUEN
WDTUEN
USBUEN
2
system clock
32-bit ARM Cortex-M3 microcontroller
LPC1311/13/42/43
SSP0/1 PERIPHERAL
CLKOUT PIN CLOCK
UART PERIPHERAL
(AHB clock enable)
USB 48 MHz CLOCK
CLOCK DIVIDER
CLOCK DIVIDER
SYSTICK TIMER
CLOCK DIVIDER
CLOCK DIVIDER
AHBCLKCTRL
AHBCLKCTRL
AHBCLKCTRL
ARM TRACE
WDT CLOCK
DIVIDER
DIVIDER
DIVIDER
14
AHB clock 0
(system)
© NXP B.V. 2011. All rights reserved.
AHB clock 1
(ROM)
AHB clock 16
(IOCONFIG)
AHB clocks
2 to 15
(memories
and peripherals)
SSP0/1
UART
ARM
trace clock
SYSTICK
timer
WDT
USB
CLKOUT pin
002aae859
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