DS51795A datasheet(21/98 Pages) MICROCHIP

21 / 98 page

Theory of Operation

DS51795A-page 17

2.4

COMMUNICATION CONNECTIONS

2.4.1

Communication Target Connections

2.4.1.1

USING SINGLE IN-LINE CONNECTOR

Use the 6-pin in-line connector between the PICkit 3 programmer/debugger and the

target board connector. See Figure 2-1. Also see Table 2-1 and

Section 10.6 “Standard Communication Hardware”.

2.4.1.2

USING AN ADAPTER

Use the AC164110 adapter between the PICkit 3 programmer/debugger and 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 RJ-11 CONNECTION AT TARGET

2.4.2

Target Connection Circuitry

Figure 2-4 shows the interconnections of the PICkit 3 programmer/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 k

Ω) is

recommended to be connected from the VPP/MCLR line to VDD so that the line may be

strobed low to reset the device.

TABLE 2-1:

TARGET CONNECTOR PINOUT

Connector Pin

Microcontroller Pin

1MCLR/VPP

2VDD

Ground

PDG (ICSPDAT)

PGC (ICSPCLK)

6LVP

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

VDD

PGD

LVP

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