Demo for dsPIC33FJ on Microstick II

Here is modified LED blinking demo for dsPIC33FJ128MC802 that is provided with Microstick II board.

Now it does following (I use it to measure FRC oscillator frequency):

• • Blinking LED on RA0 PIN 2 at frequency F_cy / 10,000,000 (TMR1 interrupt freq is f_cy / 1,000,000)
• • f_cy / 1000 output on RA1 PIN 3

In my case default f_cy = 40 MHz kHz, so f_pll = 80 MHz

Now we use PLL, so we may say:

• f_frc = 7.37 MHz
• f_pll = 80 MHz
• f_cy = 40 MHz (40 MIPS) instruction clock

Why not use MCC tool to generate sources?

The whole dsPICFJ series is NOT supported by MCC configuration tool (at least not on 2021-05-20). So you must create most of sources manually... and that's where adventure starts...

This example is originaly based on source from:

• https://ww1.microchip.com/downloads/en/DeviceDoc/CE143_Timer_Period_14aug09.zip
• available on link CE143 - Using Timer1 for Period Interrupts from dsPIC33FJ128MC802

Setup

Hardware:

• you need PIC Microstick II
• remember to insert provided dsPIC33FJ128MC802 into socket.

Software:

• XC16 v1.70
• MPLAB X IDE v5.45
• Device Family Pack (DFP): dsPIC33F-GP-MC_DFP 1.0.6 (not sure)

You can debug and/or run this project as usual (no special instructions needed).

Resources

• How to configure FRC with PLL to get f 80 MHz ( f_cy = 40 MHz, 40 MIPS):
  • http://ww1.microchip.com/downloads/en/DeviceDoc/DS-70596A.pdf