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Operation
Not all devices have the AV DD and AV SS lines, but if they are present on the target
device, all must be connected to the appropriate levels in order for the emulator to
operate.
In general, it is recommended per device data sheet that all V DD /AV DD and V SS /AV SS
lines be connected to the appropriate levels. Also, devices with a V CAP pin (like
PIC18FXXJ devices) should be connected to the appropriate capacitor or other internal
regulator device.
Note:
2.4.4
The interconnection is very simple. Any problems experienced are often
caused by other connections or components on these critical lines that
interfere with the operation of the MPLAB REAL ICE in-circuit emulator
system, as discussed in the next section.
Circuits That Will Prevent the Emulator From Functioning
Figure 2-9 shows the active emulator lines with some components that will prevent the
MPLAB REAL ICE in-circuit emulator system from functioning.
FIGURE 2-9:
IMPROPER CIRCUIT COMPONENTS
Emulator Pod
Interface
Connector
1
5
4
No!
No!
No!
No!
V PP /MCLR
PGC
PGD
Specifically, these guidelines must be followed:
? Do not use pull-ups on PGC/PGD – they will divide the voltage levels, since these
lines have 4.7 k Ω pull-down resistors in the emulator.
? Do not use capacitors on PGC/PGD – they will prevent fast transitions on data
and clock lines during programming and debug communications.
? Do not use capacitors on MCLR – they will prevent fast transitions of V PP . A
simple pull-up resistor is generally sufficient.
? Do not use diodes on PGC/PGD – they will prevent bidirectional communication
between the emulator and the target device.
For other operational issues, see:
?
?
?
?
Chapter 10. “Error Messages”
Chapter 9. “Frequently Asked Questions (FAQ)”
Section 10.3.6 “Debug Failure Actions” (Top Reasons Why You Can’t Debug)
Section 12.8 “Loop-Back Test Board”
? 2008 Microchip Technology Inc.
DS51616B-page 19
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