PIC24HJ128GP310 datasheet(224/286 Pages) MICROCHIP

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PIC24HJXXXGPX06/X08/X10

DS70175F-page 222

20.5

JTAG Interface

PIC24HJXXXGPX06/X08/X10 devices implement a

JTAG interface, which supports boundary scan device

testing, as well as in-circuit programming. Detailed

information on the interface will be provided in future

revisions of the document.

20.6

Code Protection and

CodeGuard™ Security

The PIC24H product families offer advanced imple-

mentation of CodeGuard™ Security. CodeGuard

Security enables multiple parties to securely share

resources (memory, interrupts and peripherals) on a

single chip. This feature helps protect individual

Intellectual Property in collaborative system designs.

When coupled with software encryption libraries,

CodeGuard Security can be used to securely update

Flash even when multiple IP are resident on the single

chip. The code protection features vary depending on

the actual PIC24H implemented. The following

sections provide an overview these features.

The code protection features are controlled by the

Configuration registers: FBS, FSS and FGS.

20.7

In-Circuit Serial Programming

Programming Capability

PIC24HJXXXGPX06/X08/X10 family digital signal con-

trollers can be serially programmed while in the end

application circuit. This is simply done with two lines for

clock and data and three other lines for power, ground

and the programming sequence. This allows custom-

ers to manufacture boards with unprogrammed

devices and then program the digital signal controller

just before shipping the product. This also allows the

most recent firmware or a custom firmware, to be pro-

grammed. Please refer to the “dsPIC33F Flash Pro-

gramming Specification” (DS70152) document for

details about ICSP

programming capability.

Any 1 out of 3 pairs of programming clock/data pins

may be used:

• PGC1/EMUC1 and PGD1/EMUD1

• PGC2/EMUC2 and PGD2/EMUD2

• PGC3/EMUC3 and PGD3/EMUD3

20.8

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. Debugging functionality is controlled

through the EMUCx (Emulation/Debug Clock) and

EMUDx (Emulation/Debug Data) pin functions.

Any 1 out of 3 pairs of debugging clock/data pins may

be used:

• PGC1/EMUC1 and PGD1/EMUD1

• PGC2/EMUC2 and PGD2/EMUD2

• PGC3/EMUC3 and PGD3/EMUD3

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

the design must implement ICSP programming capa-

bility connections to MCLR, VDD, VSS, PGC, PGD and

the EMUDx/EMUCx pin pair. In addition, when the fea-

ture 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.

Note:

Refer to CodeGuard Security Reference

Manual (DS70180) for further information

on usage, configuration and operation of

CodeGuard Security.

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