EA-QSB-012 Embedded Artists, EA-QSB-012 Datasheet - Page 23

• Manufacturer Part Number: EA-QSB-012
• Description: BOARD QUICK START LPC1343
• Manufacturer: Embedded Artists

Specifications of EA-QSB-012

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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.
LPC1311/13/42/43 clocking generation block diagram
(system PLL clock select)
(USB clock select)
USBPLLCLKSEL
SYSPLLCLKSEL
Following reset, the LPC1311/13/42/43 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 7
SYSTEM PLL
(main clock select)
USB PLL
MAINCLKSEL
for an overview of the LPC1311/13/42/43 clock generation.
All information provided in this document is subject to legal disclaimers.
main clock
Rev. 3 — 10 August 2010
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
system clock
32-bit ARM Cortex-M3 microcontroller
LPC1311/13/42/43
CLKOUT PIN CLOCK
UART PERIPHERAL
(AHB clock enable)
USB 48 MHz CLOCK
SSP PERIPHERAL
CLOCK DIVIDER
CLOCK DIVIDER
CLOCK DIVIDER
SYSTICK TIMER
CLOCK DIVIDER
AHBCLKCTRL
AHBCLKCTRL
AHBCLKCTRL
ARM TRACE
WDT CLOCK
DIVIDER
DIVIDER
DIVIDER
14
© NXP B.V. 2010. All rights reserved.
AHB clock 0
(system)
AHB clock 16
(IOCONFIG)
AHB clock 1
(ROM)
AHB clocks
2 to 15
(memories
and peripherals)
SSP
UART
ARM
trace clock
SYSTICK
timer
WDT
USB
CLKOUT pin
002aae859
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