User manual

Theory of Operation

FIGURE 2-2: STANDARD DEBUGGER SYSTEM – ICE DEVICE

2.5 COMMUNICATION CONNECTIONS

2.5.1 Standard Communication Target Connection

Using the RJ-11 connector, the MPLAB ICD 3 in-circuit debugger is connected to the

target device with the modular interface (six conductor) cable. The pin numbering for

the connector is shown from the bottom of the target PC board in Figure 2-3.

FIGURE 2-3: STANDARD CONNECTION AT TARGET

2.5.2 Target Connection Circuitry

Figure 2-4 shows the interconnections of the MPLAB ICD 3 in-circuit debugger to the

connector on the target board. The diagram also shows the wiring from the connector

to a device on the target PC board. A pull-up resistor (usually around 10 kΩ) is

recommended to be connected from the V

PP/MCLR line to VDD so that the line may be

strobed low to reset the device.

MPLAB

ICD 3

Target Board

Transition Socket

Device-ICE

Processor Pak

Standard

Adapter

Header

Device-ICE

ICD Header

Power

Note: Cable connections at the debugger and target are mirror images of each

other, i.e., pin 1 on one end of the cable is connected to pin 6 on the other

end of the cable. See Section 10.6.2.3 “Modular Cable Specification”.

Target

Connector

Target

Bottom Side

PC Board

VPP/MCLR

Vss

PGC

PGD

LVP