Datasheet

dsPIC30F4011/4012

21.7 In-Circuit Debugger

When MPLAB

ICD 2 is selected as a debugger, the

in-circuit debugging functionality is enabled. This func-

tion allows simple debugging functions when used with

MPLAB IDE. When the device has this feature enabled,

some of the resources are not available for general

use. These resources include the first 80 bytes of data

RAM and two I/O pins.

one of four pairs of debug I/O pins may be selected by

the user using configuration options in MPLAB IDE.

These pin pairs are named EMUD/EMUC, EMUD1/

EMUC1, EMUD2/EMUC2 and EMUD3/EMUC3.

In each case, the selected EMUD pin is the emulation/

debug data line and the EMUC pin is the emulation/

debug clock line. These pins interface to the MPLAB

ICD 2 module available from Microchip. The selected

pair of debug I/O pins is used by MPLAB ICD 2 to send

commands and receive responses, as well as to send

and receive data. To use the in-circuit debugger func-

tion of the device, the design must implement ICSP

connections to MCLR

, VDD, VSS, PGC, PGD and the

selected EMUDx/EMUCx pin pair.

This gives rise to two possibilities:

1. If EMUD/EMUC is selected as the debug I/O pin

pair, then only a 5-pin interface is required as the

EMUD and EMUC pin functions are multiplexed

with the PGD and PGC pin functions in all

dsPIC30F devices.

2. If EMUD1/EMUC1, EMUD2/EMUC2 or EMUD3/

EMUC3 is selected as the debug I/O pin pair,

then a 7-pin interface is required as the EMUDx/

EMUCx pin functions (x = 1, 2 or 3) are not

multiplexed with the PGD and PGC pin

functions.