Datasheet

LPC81XM All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4.3 — 22 April 2014 24 of 76
NXP Semiconductors
LPC81xM
32-bit ARM Cortex-M0+ microcontroller
8.20 Clocking and power control
8.20.1 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 10. LPC81xM clock generation
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