16-Bit Oscillator System: PLL Overview

Overview

The system clock for all 16-bit PIC® MCU and dsPIC® MCUs includes a frequency multiplier branch built around a PLL (Phase-Locked Loop). Depending on the device variant, the following PLL types are implemented:

  • 4x PLL (32MHz) (PIC24F GA, GC, KA, KL, KM)
  • 24x PLL (96MHz) (PIC24F GB, DA)
  • 80 MHz PLL (dsPIC33F/PIC24H)
  • 140 MHz PLL (dsPIC33E/PIC24E)

The System PLL can use the Fast RC (FRC) or Primary (POSC) Oscillator as the input. The input is indirectly determined by the System Clock setting (FNOSC bits).

For some of these blocks, certain PLL parameters may be set at build-time via configuration bits, as well as at run-time via SFR register modification.

pll_generic.png

  Return to Top

© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.