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PICkit? 3 User’s Guide
? Will the PICkit 3 slow down the running of the program?
No, the device will run at any device speed as specified in the data sheet.
? Is it possible to debug a dsPIC DSC running at any speed?
The PICkit 3 is capable of debugging at any device speed as specified in the
device’s data sheet.
? What is the function of pin 6, the LVP pin?
Pin 6 is reserved for the LVP (Low-Voltage Programming) connection.
7.3
WHAT’S WRONG
? My PC went into power-down/hibernate mode, and now my debugger won’t
work. What happened?
When using the debugger for prolonged periods of time, and especially as a
debugger, be sure to disable the Hibernate mode in the Power Options Dialog
window of your PC’s operating system. Go to the Hibernate tab and clear or
uncheck the “Enable hibernation” check box. This will ensure that all
communication is maintained across all the USB subsystem components.
? I set my peripheral to NOT freeze on halt, but it is suddenly freezing. What's
going on?
For dsPIC30F/33F and PIC24F/H devices, a reserved bit in the peripheral control
register (usually either bit 14 or 5) is used as a Freeze bit by the debugger. If you
have performed a write to the entire register, you may have overwritten this bit.
(The bit is user-accessible in Debug mode.)
To avoid this problem, write only to the bits you wish to change for your application
( BTS , BTC ) instead of to the entire register ( MOV ).
? When using a 16-bit device, an unexpected reset occurred. How do I
determine what caused it?
Some things to consider:
- To determine a reset source, check the RCON register.
- Handle traps/interrupts in an Interrupt Service Routine (ISR). You should
include trap.c style code, i.e.,
DS51795A-page 38
void __attribute__((__interrupt__))
:
void __attribute__((__interrupt__))
:
void __attribute__((__interrupt__))
{
INTCON1bits.OSCFAIL = 0;
while (1);
}
:
void __attribute__((__interrupt__))
{
INTCON1bits.OSCFAIL = 0;
while (1);
}
:
- Use ASSERTs.
_OscillatorFail(void);
_AltOscillatorFail(void);
_OscillatorFail(void)
//Clear the trap flag
_AltOscillatorFail(void)
? 2009 Microchip Technology Inc.
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