I have a PIC24F Development Board an Explorer 16/32 with a PIC24FJ1024GB610 General Purpose Plug-in Module (Part # MA240023)

I would like to create a simple program where the clock signal would be sourced from the Secondary Oscillator (SOSC), I would like to use one of the external oscillators (32.768KHz) on the development board, as shown in the picture below.

enter image description here This is from the PIC24FJ1024GB610's Datasheet

However this is what confuses, in the Explorer 16/32 schematic, crystal Y2 of 32.768 KHz is connected to the SOSCI (P73) and SOSCO (P74) of the microcontroller, and in the PIC24FJ1024GB610 PIM schematic, crystal X1 of 32.768 KHz is connected to SOSCI/RC13 (P73) and SOSCO/RC14 (P74).

A printout of the two crystal schematics is shown below.

enter image description here

do the SOSCI and SOSCO pins have 2 32.768KHz oscillators connected to it, or do we disconnect one oscillator and keep the other? (I don't see any jumpers).

Your help is highly appreciated.


1 Answer 1


Take a look at the link your provided for the PIM module. The "Pin Mapping" section explain this:

There are several device pins that don’t have a one-to-one connection to the ICE connector. Some are hard-wired to a certain location, while others are mapped to the connector through jumpers.

In the Table 1, you can see thant the SOSCI and SOSCO pins are not connected to a PIM pin.

Pin Mapping Exception

The Crystal on the Explorer 16/32 will not be used. Only the one on the PIM.

  • \$\begingroup\$ So the Secondary OSC at the explorer DB is not connected to the PIM header, but the one on the PIM is connected. Thanks for clearing that up \$\endgroup\$ Apr 8, 2020 at 11:18

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