Standard Communication Hardware - Microchip Technology MPLAB ICD 3 User Manual

In-circuit debugger
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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.
Note:
For more on available header boards, see the "Header Board Specification"
(DS51292).
10.6.1
The standard communication is the main interface to the target processor. It contains
the connections to the high voltage (V
connections required for programming and connecting with the target devices.
The V
volts to satisfy the voltage requirements for the specific emulation processor.
The V
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
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:
© 2008 Microchip Technology Inc.
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.
Standard Communication
high-voltage lines can produce a variable voltage that can swing from 0 to 14
PP
sense connection draws very little current from the target processor. The
DD
6-PIN STANDARD PINOUT
Standard Socket
2
4
6
Bottom of
Target Board
1
3
5
Hardware Specification
), V
sense lines, and clock and data
PP
DD
Pin
Name
Function
1
V
Power
PP
2
V
_TGT
Power on target
DD
3
GND
Ground
4
PGD (ICSPDAT) Standard Com Data
5
PGC (ICSPCLK) Standard Com Clock
6
LVP
Low Voltage Programming
DD
connection
DD
DS51766A-page 81

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