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MPLAB ? REAL ICE ? In-Circuit Emulator User’s Guide
2.5.5
SPI/UART Trace Connections (Future)
When using high-speed communications, streaming serial trace is possible using the
device SPI/UART and pins 7 (DAT) and 8 (CLK). Figure 2-10 shows these additional
connections. As with pins 4 (PBD) and 5 (PGC) ( Section 2.5.4 “Circuits That Will
Prevent the Emulator From Functioning” ), do not use pull-ups, capacitors or diodes.
FIGURE 2-10:
SERIAL TRACE CONNECTIONS
Application
PC Board
5
Device
MPLAB ?
REAL
ICE ?
In-Circuit
Emulator
Interface
Connector
7
8
SPI/UART
DAT
CLK
2.5.6
I/O Port Trace Connections
Streaming parallel trace is possible using a device I/O port and the emulator logic probe
connector. This provides greater trace speed and data quantity, but limits
emulator-to-target distance by the length of the parallel cable. Figure 2-11 shows these
additional connections.
FIGURE 2-11:
PARALLEL TRACE CONNECTIONS
Application
PC Board
Device
MPLAB ?
REAL
ICE ?
Interface
Connector
5
In-Circuit
Emulator
Probe
Connector
PORTx
For this trace configuration, seven (7) lines of data and one (1) line for clock are
transmitted (see Section 7.5.4 “Logic Probe/External Trigger Interface” .)
As with pins 4 (PBD) and 5 (PGC) ( Section 2.5.4 “Circuits That Will Prevent the
Emulator From Functioning” ), do not use pull-ups, capacitors or diodes. However, to
use probe pins as inputs, you must provide the circuitry to drive them. Unused pins
should either be pulled up or grounded. Floating pins may produce false triggers.
For more on this type of trace, see Section 5.5.2 “I/O Port Trace” .
DS51616A-page 16
? 2006 Microchip Technology Inc.
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