MPLAB ICD 3 In-Circuit Debugger User's Guide

MPLAB ® ICD 3 In-Circuit Debugger User’s Guide6.3 WHAT’S WRONG• Does the MPLAB ICD 3 in-circuit debugger have complex breakpoints likeMPLAB ICE 2000/4000?Yes. You can break based on a value in a data memory location. You can also dosequenced breakpoints, where several events are happening before it breaks, butyou can only do 2 sequences instead of 4, as you can in the MPLAB ICE 2000.You can also do the AND condition and do PASS counts. SeeSection 9.3.1 “Breakpoints Dialog” for more information.• Are any of the driver boards optoisolated or electrically isolated?They are DC optoisolated, but not AC optoisolated. You cannot apply a floating orhigh voltage (120V) to the current system.• What limitations are there with the standard cable?The standard ICSP RJ-11 cable does not allow for clock speeds greater thanabout 15 Mb/sec. dsPIC33F DSCs running at full speed are greater than the 15Mb/sec limit.• Will this slow down the running of the program?There is no cycle stealing with the MPLAB ICD 3 in-circuit debugger. The output ofdata is performed by the state machine in the silicon.• Is it possible to debug a dsPIC DSC running at any speed?The MPLAB ICD 3 is capable of debugging at any device speed as specified inthe 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.• My PC went into power-down/hibernate mode, and now my debugger won’twork. What happened?When using the debugger for prolonged periods of time, and especially as adebugger, be sure to disable the Hibernate mode in the Power Options Dialogwindow of your PC’s operating system. Go to the Hibernate tab and clear oruncheck the “Enable hibernation” check box. This will ensure that allcommunication is maintained across all the USB subsystem components.• I set my peripheral to NOT freeze on halt, but it is suddenly freezing. What'sgoing on?For dsPIC30F/33F and PIC24F/H devices, a reserved bit in the peripheral controlregister (usually either bit 14 or 5) is used as a Freeze bit by the debugger. If youhave 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).DS51766A-page 50© 2008 Microchip Technology Inc.