70592C datasheet(228/314 Pages) MICROCHIP

228 / 314 page

PIC24HJXXXGPX06A/X08A/X10A

DS70592C-page 228

21.5

JTAG Interface

PIC24HJXXXGPX06A/X08A/X10A 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.

21.6

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.

21.7

In-Circuit Serial Programming

Programming Capability

PIC24HJXXXGPX06A/X08A/X10A family digital signal

controllers 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/PIC24H

Flash

Programming

Specification”

(DS70152)

document for details about ICSP programming

capability.

Any one out of three pairs of programming clock/data

pins may be used:

• PGEC1 and PGED1

• PGEC2 and PGED2

• PGEC3 and PGED3

21.8

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 PGECx (Emulation/Debug Clock) and

PGEDx (Emulation/Debug Data) pin functions.

Any one out of three pairs of debugging clock/data pins

may 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 programming capa-

bility connections to MCLR, VDD, VSS and the PGEDx/

PGECx 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.

Note:

For further information, refer to the

dsPIC33F/PIC24H

Family

Reference

Manual“, Section 24. “Programming

and Diagnostics” (DS70246), which is

available from the Microchip website

(www.microchip.com).

Note:

For further information, refer to the

“dsPIC33F/PIC24H

Family

Reference

Manual”, Section 23. “CodeGuard™

Security” (DS70239), which is available

from

the

Microchip

website

(www.microchip.com).

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