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MPLAB ? REAL ICE ? In-Circuit Emulator User’s Guide
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.
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.
FIGURE 2-7:
HIGH-SPEED CONNECTION AT TARGET
J1
V PP /MCLR
2.5.3
1
2
3
4
5
6
7
8
Target Connection Circuitry
V DD
V SS
PGD
PGC
DAT
CLK
Top of
Target
Board
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-u p 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
2
User Reset
1K-10K
Application
PC Board
V DD
Device
AV DD
MPLAB ?
REAL
ICE ?
In-Circuit
Emulator
Interface
Connector
1
5
4
3
V PP /MCLR
PGC
PGD
V SS
AV SS
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.
DS51616A-page 14
? 2006 Microchip Technology Inc.
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