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© 2005 Microchip Technology Inc. DS93003A-page 1
GS003
INTRODUCTION
This document describes useful options that facilitate
in-circuit debugging of dsPIC30F embedded
application programs.
MULTIPLE DEBUGGING CHANNELS
dsPIC30F Digital Signal Controllers use Microchip's
low-cost development tool, MPLAB
®
ICD 2 In-Circuit
Debugger for both programming and in-circuit debug-
ging. MPLAB ICD 2 provides a 5-pin interface to the
dsPIC30F device. These pins are: V
DD, VSS, MCLR,
PGC/EMUC and PGD/EMUD. The PGC/EMUC and
PGD/EMUD pins are used to communicate clock and
data signals, respectively, between the MPLAB ICD 2
unit and the dsPIC30F device during programming and
debugging operations.
To give you flexibility in board layout, dsPIC30F DSC
devices provide multiple options for connecting the
MPLAB ICD 2 to your target board for in-circuit debug-
ging. dsPIC30F devices are available in packages
ranging from 18 to 80 pins. Devices in small packages
often have several peripheral functions multiplexed on
each pin (see Figure 1). In certain cases, the default
programming and debugging pin functions, PGC/
EMUC and PGD/EMUD, are multiplexed on pins that
may be used by other peripherals like the I
2
C™, SPI™,
or UART modules. In such cases, the application is
able to use these pins for programming, however they
cannot be used for in-circuit debugging. In-circuit
debugging should then be performed using alternate
debugging channels, as listed in Table 1. You should
note that the device programming and connect opera-
tions using MPLAB ICD 2 will continue to require the
use of the PGC and PGD pins.
TABLE 1: DEBUGGING CHANNELS
FIGURE 1: TYPICAL ALTERNATE
DEBUGGING CHANNEL
Author: Hrushikesh (Rishi) Vasuki
Microchip Technology
Pin Name Pin Function
EMUD
EMUC
Default Debug Data pin
Default Debug Clock pin
EMUD1
EMUC1
Alternate Debug Channel #1 Data pin
Alternate Debug Channel #1 Clock pin
EMUD2
EMUC2
Alternate Debug Channel #2 Data pin
Alternate Debug Channel #2 Clock pin
EMUD3
EMUC3
Alternate Debug Channel #3 Data pin
Alternate Debug Channel #3 Clock pin
PGC/EMUC/SDA
*
PGD/EMUD/SCL
*
PGC
PGD
V
DD
V
SS
VPP
VDD
VSS
MCLR
Program
Debug
ICD 2 Header
dsPIC30F3012
EMUD3*
EMUC3*
To I
2
C™ Device
Switch
12
11
1
13
14
* Pin Multiplexing on dsPIC30F3012 (PDIP Package):
Pin Multiplexed Functions
2 EMUD3/AN0/V
REF+/CN2/RB0
3 EMUC3/AN1/V
REF-/CN3/RB1
11 PGD/EMUD/AN6/U1TX/SDO1/SCL/CN6/RB4
12 PGC/EMUC/AN5/U1RX/SDI1/SDA/CN7/RB5
2
3
In-Circuit Debugging Interface Options with dsPIC DSC
