DSPIC33FJMC202ESS datasheet(217/330 Pages) MICROCHIP

217 / 330 page

DS70283K-page 217

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

21.5

JTAG Interface

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

devices implement a JTAG interface, which supports

boundary scan device testing, as well as in-circuit

programming. Detailed information on this interface will

be provided in future revisions of the document.

21.6

In-Circuit Serial Programming

dsPIC33FJ32MC202/204 and dsPIC33FJ16MC304

family digital signal controllers can be serially

programmed while in the end application circuit. This is

done with two lines for clock and data and three other

lines for power, ground and the programming

sequence. Serial programming allows customers to

manufacture boards with unprogrammed devices and

then program the digital signal controller just before

shipping the product. Serial programming also allows

the most recent firmware or a custom firmware to be

programmed. Refer to the “dsPIC33F/PIC24H Flash

Programming Specification” (DS70152) document for

details about In-Circuit Serial Programming (ICSP).

Any of the three pairs of programming clock/data pins

can be used:

• PGEC1 and PGED1

• PGEC2 and PGED2

• PGEC3 and PGED3

21.7

In-Circuit Debugger

When MPLAB® ICD 2 is selected as a debugger, the

in-circuit debugging functionality is enabled. This

function allows simple debugging functions when used

with MPLAB IDE. Debugging functionality is controlled

through the PGECx (Emulation/Debug Clock) and

PGEDx (Emulation/Debug Data) pin functions.

Any of the three pairs of debugging clock/data pins can

be used:

• PGEC1 and PGED1

• PGEC2 and PGED2

• PGEC3 and PGED3

To use the in-circuit debugger function of the device,

the design must implement ICSP connections to

MCLR, VDD, VSS, and the PGECx/PGEDx pin pair. In

addition, when the feature is 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.

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