LPC5410X datasheet(33/95 Pages) NXP

33 / 95 page

LPC5410x

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Product data sheet

Rev. 2.11 — 19 September 2019

33 of 95

NXP Semiconductors

LPC5410x

32-bit ARM Cortex-M4/M0+ microcontroller

• Burst conversion mode for single or multiple inputs.

• Synchronous or asynchronous operation. Asynchronous operation maximizes

flexibility in choosing the ADC clock frequency, Synchronous mode minimizes trigger

latency and can eliminate uncertainty and jitter in response to a trigger.

7.20 System control

7.20.1 Clock sources

The LPC5410x supports two external and three internal clock sources:

• The Internal RC (IRC).

• Watchdog oscillator (WDOSC).

• External clock source from the digital I/O pin CLKIN.

• External RTC 32 KHz clock.

• Output of the system PLL.

7.20.1.1 Internal RC oscillator (IRC)

The IRC can be used as the clock that drives the system PLL and subsequently the CPU.

The nominal IRC frequency is 12 MHz.

Upon power-up or any chip reset, the LPC5410x uses the IRC as the clock source.

Software may later switch to one of the other available clock sources.

7.20.1.2 Watchdog oscillator (WDOSC)

The watchdog oscillator is a low-power internal oscillator. The WDOSC can be used to

provide a clock to the WWDT and to the entire chip. The nominal output frequency is

500 kHz.

7.20.1.3 Clock input pin (CLKIN)

An external square-wave clock source (up to 25 MHz) can be supplied on the digital I/O

pin CLKIN.

7.20.2 System PLL

The system PLL accepts an input clock frequency in the range of 32 kHz to 12 MHz. The

input frequency is multiplied up to a high frequency with a Current Controlled Oscillator

(CCO).

The PLL can be enabled or disabled by software.

LPC5410X Datasheet(PDF) 33 Page - NXP Semiconductors