User manual

MPLAB
®
REAL ICE
™
In-Circuit Emulator User’s Guide
DS51616B-page 18 © 2008 Microchip Technology Inc.
2.4.2 High-Speed Communication 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
2.4.3 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 (typically 10 kΩ) is
recommended to be connected from the V
PP/MCLR line to VDD 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 (VDD) and 3 (VSS) 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 from the emulator to the target are shown in
Section 12.7 “High-Speed Communication Hardware”.
1
2
3
4
5
6
7
8
J1
Top of
Target
Board
VPP/MCLR
VSS
PGC
V
DD
PGD
DAT*
CLK*
Used for optional SPI trace
capability. See
Section 2.5.2 “SPI Trace
Connections (High-Speed
Communication Only)”.
*
V DD
V PP /MCLR
PGC
PGD
V
SS
AV DD
AV SS
2
1
5
4
3
User Reset
4.7K-10K
Interface
Connector
Application
PC Board
Device
ACTIVE STATUS
RESETFUNCTION
Emulator Pod
XTAL