User manual

Operation
© 2008 Microchip Technology Inc. DS51616B-page 21
2.5.3 I/O Port Trace Connections
Streaming parallel trace is possible using a device 8-pin 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 logic probe connectors. Figure 2-11
shows these additional connections.
FIGURE 2-11: PARALLEL TRACE CONNECTIONS
For this trace configuration, seven (7) lines of data and one (1) line for clock are
transmitted. PORTx must be a port with 8 pins that has all 8 pins available for trace.
The port must not be multiplexed with the currently-used PGC and PGM pins.
A basic configuration is shown in Table 2-1: “I/O Port Trace Connection Example”.
As in Section 2.4.4 “Circuits That Will Prevent the Emulator From Functioning”,
do not use pull-up resistors, capacitors or diodes on port pins, except as specified.
For more on this type of trace, see Section 7.3.3.2 “I/O Port Trace.
TABLE 2-1: I/O PORT TRACE CONNECTION EXAMPLE
PORTx pin Logic Probe pin
(1)
Content
0 EXT0 Data
1 EXT1 Data
2 EXT2 Data
3 EXT3 Data
4 EXT4 Data
5 EXT5 Data
6 EXT6 Data
7 EXT7
(2)
Clock
Note 1: For pin descriptions, see Section 12.5.4 “Logic Probe/External Trigger Inter-
face”.
2: Use a 10KΩ pull-down resistor.
Interface
Connector
Application
PC Board
5
Device
PORTx
Probe
Connector
6:0
7
10KΩ
ACTIVE
STATUS
RESETFUNCTION
Emulator Pod
7