LPC81XM datasheet(22/67 Pages) NXP

22 / 67 page

LPC81xM

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Objective data sheet

Rev. 1.0 — 7 November 2012

22 of 67

NXP Semiconductors

LPC81xM

32-bit ARM Cortex-M0+ microcontroller

7.20 Clocking and power control

7.20.1 Crystal and internal oscillators

The LPC81xM include four independent oscillators:

1. The crystal oscillator (SysOsc) operating at frequencies between 1 MHz and 25 MHz.

2. The internal RC Oscillator (IRC) with a fixed frequency of 12 MHz, trimmed to 1%

accuracy.

3. The internal low-power, low-frequency Oscillator with a nominal frequency of 10 kHz

with 40% accuracy for use with the self wake-up timer.

4. The dedicated Watchdog Oscillator (WDOsc) with a programmable nominal

frequency between 9.4 kHz and 2.3 MHz with 40% accuracy.

Fig 9.

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