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PICkit? 3 User’s Guide
FIGURE 5-1:
CONNECTING THE DEMO BOARD TO THE PICkit? 3
5.3.3
Configuration Bits and Debug Express
PIC microcontroller devices that do not require an ICD Header and may be debugged
directly contain a DEBUG bit in the Configuration Word(s) that enables and disables
the debug mode on the PIC microcontroller.
This bit is automatically set appropriately by the MPLAB IDE when using PICkit 3
Debug Express and should not be specified in source code configuration settings.
CAUTION
The DEBUG configuration bit value should not be specified in source code Configura-
tion settings under normal conditions. Doing so may cause the bit to be asserted when
programming a device outside the debugger. This will cause the device to function
improperly or not all at in the application circuit.
Many 16-bit PIC microcontroller devices such as PIC24 and dsPIC33 families have
multiple ICSP programming and debugging port pins labeled PGC1/EMUC1 and
PGD1/EMUD1, PGC2/EMUC2 and PGD2/EMUD2, etc. While any ICSP port may be
used for programming, only one port is active at a time for debugging. The active EMU
port is set in the device Configuration bits. If the active port setting does not match the
EMU port to which the PICkit 3 is connected, the device will be unable to enter debug
mode. In the MPLAB IDE Configuration Bits dialog, these bits are usually referred to as
the “Comm Channel Select” bits.
DS51795A-page 32
? 2009 Microchip Technology Inc.
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