Microchip Technology AC244006 Manuel D’Utilisation

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MPLAB
®
 REAL ICE
 In-Circuit Emulator User’s Guide
DS51616A-page 14
 
© 2006 Microchip Technology Inc.
2.5.2
High-Speed Communications Target Connection
Using the high-speed driver/receiver board combination, the MPLAB REAL ICE 
in-circuit emulator is connected to the target device with an 8-pin interface. The pin 
numbering for the connector is shown from the top of the target PC board in Figure 2-7.
FIGURE 2-7:
HIGH-SPEED CONNECTION AT TARGET
2.5.3
Target Connection Circuitry
Figure 2-8 shows the interconnections of the MPLAB REAL ICE in-circuit emulator 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 V
PP
/MCLR line to V
DD
 so that the line may 
be strobed low to reset the device.
FIGURE 2-8:
STANDARD CONNECTION TARGET CIRCUITRY
In the following descriptions, only three lines are active and relevant to core emulator 
operation: pins 1 (V
PP
/MCLR), 5 (PGC) and 4 (PGD). Pins 2 (V
DD
) and 3 (V
SS
) are 
shown on the above diagram for completeness, but are only sensed, not provided or 
controlled, by the emulator.
Be aware that the target V
DD
 is sensed by the emulator to allow level translation for 
target low-voltage operation. If the emulator does not sense voltage on its V
DD
 line (pin 
2 of the interface connector), it will not operate.
Note: Connections at the emulator and target are mirror images of each other, 
i.e., pin 1 on the receiver board is connected to pin 1 on the target board.
1
2
3
4
5
6
7
8
J1
Top of
Target
Board
V
PP
/MCLR
V
SS
PGC
V
DD
PGD
DAT
CLK
V
DD
V
PP
/MCLR
PGC
PGD
V
SS
AV
DD
AV
SS
2
1
5
4
3
User Reset
1K-10K
Interface
Connector
Application
PC Board
Device
MPLAB
®
 
REAL 
ICE
™  
In-Circuit 
Emulator