SiM3U1xx Clocking Options

by <a href=""><font color="#000000"><font size="2">Hero Employee</font></font> </a> Silicon_Labs on ‎11-24-2014 08:44 AM


What are the possible clock sources for SiM3U1xx devices?



SiM3U1xx devices have seven options for the AHB clock:

RTC0 Oscillator: 32 kHz
Low Frequency Oscillator (LFOSC0): 16.4 kHz
Low Power Oscillator (LPOSC0): 20 MHz
Divided Low Power Oscillator: 2.5 MHz
External Oscillator: varies
PLL0 Oscillator: 23 - 80 MHz
USB0 Oscillator: 48 MHz

More information on each of these clock sources can be found in AN663: Precision32 MCU Family Clocking Options, the SiM3U1xx data sheet, and the SiM3U1xx/SiM3C1xx reference manual.  The 32-bit MCU application notes and device documentation can be found here: