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PIC32MX3XX/4XX
2.5 ICSP Pins
The PGECx and PGEDx pins are used for In-Circuit
Serial Programming? (ICSP?) and debugging pur-
poses. It is recommended to keep the trace length
between the ICSP connector and the ICSP pins on the
device as short as possible. If the ICSP connector is
expected to experience an ESD event, a series resistor
is recommended, with the value in the range of a few
tens of Ohms, not to exceed 100 Ohms.
Pull-up resistors, series diodes and capacitors on the
PGECx and PGEDx pins are not recommended as they
will interfere with the programmer/debugger communi-
cations to the device. If such discrete components are
an application requirement, they should be removed
from the circuit during programming and debugging.
Alternately, refer to the AC/DC characteristics and tim-
ing requirements information in the respective device
Flash programming specification for information on
capacitive loading limits and pin input voltage high (V IH )
and input low (V IL ) requirements.
Pull-up resistors, series diodes and capacitors on the
TMS, TDO, TDI and TCK pins are not recommended
as they will interfere with the programmer/debugger
communications to the device. If such discrete compo-
nents are an application requirement, they should be
removed from the circuit during programming and
debugging. Alternately, refer to the AC/DC characteris-
tics and timing requirements information in the respec-
tive device Flash programming specification for
information on capacitive loading limits and pin input
voltage high (V IH ) and input low (V IL ) requirements.
2.7 Trace
The trace pins can be connected to a hardware-trace-
enabled programmer to provide a compress real time
instruction trace. When used for trace the TRD3,
TRD2, TRD1, TRD0 and TRCLK pins should be dedi-
cated for this use. The trace hardware requires a 22
Ohm series resistor between the trace pins and the
trace connector.
Ensure that the “Communication Channel Select” (i.e.,
PGECx/PGEDx pins) programmed into the device
2.8
External Oscillator Pins
matches the physical connections for the ICSP to
MPLAB ? ICD 2, MPLAB ICD 3 or MPLAB REAL ICE?.
For more information on ICD 2, ICD 3 and REAL ICE
connection requirements, refer to the following
documents that are available on the Microchip website.
? “MPLAB ? ICD 2 In-Circuit Debugger User ’s
Guide” DS51331
? “Using MPLAB ? ICD 2” (poster) DS51265
? “MPLAB ? ICD 2 Design Advisory” DS51566
? “Using MPLAB ? ICD 3” (poster) DS51765
? “MPLAB ? ICD 3 Design Advisory” DS51764
? “MPLAB ? REAL ICE? In-Circuit Debugger
User ’s Guide” DS51616
? “Using MPLAB ? REAL ICE?” (poster) DS51749
Many MCUs have options for at least two oscillators: a
high-frequency primary oscillator and a low-frequency
Configuration” for details).
The oscillator circuit should be placed on the same
side of the board as the device. Also, place the
oscillator circuit close to the respective oscillator pins,
not exceeding one-half inch (12 mm) distance
between them. The load capacitors should be placed
next to the oscillator itself, on the same side of the
board. Use a grounded copper pour around the
oscillator circuit to isolate them from surrounding
circuits. The grounded copper pour should be routed
directly to the MCU ground. Do not run any signal
traces or power traces inside the ground pour. Also, if
using a two-sided board, avoid any traces on the
2.6
JTAG
other side of the board where the crystal is placed. A
The TMS, TDO, TDI and TCK pins are used for testing
and debugging according to the Joint Test Action
Group (JTAG) standard. It is recommended to keep the
trace length between the JTAG connector and the
JTAG pins on the device as short as possible. If the
JTAG connector is expected to experience an ESD
event, a series resistor is recommended, with the value
in the range of a few tens of Ohms, not to exceed 100
Ohms.
? 2010 Microchip Technology Inc.
FIGURE 2-3:
SUGGESTED PLACEMENT
OF THE OSCILLATOR
CIRCUIT
Oscillator
Secondary
Guard Trace
Guard Ring
Main Oscillator
DS61143G-page 33
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