User manual

Hardware Specification

10.6 STANDARD COMMUNICATION HARDWARE

For standard debugger communication with a target (Section 2.4 “Debugger To

Target Communication”, “Standard ICSP Device Communication“), use the RJ-11

connector.

To use this type of communication with a header board, you may need a device-specific

Processor Pak, which includes an 8-pin connector header board containing the desired

ICE/ICD device and a standard adapter board.

For more on available header boards, see the “Header Board Specification”

(DS51292).

10.6.1 Standard Communication

The standard communication is the main interface to the target processor. It contains

the connections to the high voltage (V

PP), VDD sense lines, and clock and data

connections required for programming and connecting with the target devices.

The V

PP high-voltage lines can produce a variable voltage that can swing from 0 to 14

volts to satisfy the voltage requirements for the specific emulation processor.

The V

DD sense connection draws very little current from the target processor. The

actual power comes from the MPLAB ICD 3 in-circuit debugger system as the V

sense line is used as a reference only to track the target voltage. The V

DD connection

is isolated with an optical switch.

The clock and data connections are interfaces with the following characteristics:

• Clock and data signals are in high-impedance mode (even when no power is

applied to the MPLAB ICD 3 in-circuit debugger system)

• Clock and data signals are protected from high voltages caused by faulty targets

systems, or improper connections

• Clock and data signals are protected from high current caused from electrical

shorts in faulty target systems

FIGURE 10-1: 6-PIN STANDARD PINOUT

Note: Older header boards used a 6-pin (RJ-11) connector instead of an 8-pin

connector, so these headers may be connected directly to the debugger.

Pin Name Function

PP Power

DD_TGT Power on target

3 GND Ground

4 PGD (ICSPDAT) Standard Com Data

5 PGC (ICSPCLK) Standard Com Clock

6 LVP Low Voltage Programming

Bottom of

Target Board

Standard Socket