70592C Datasheet, PDF (228/314 Pages) Microchip Technology – High-Performance, 16-bit Microcontrollers

PIC24HJXXXGPX06A/X08A/X10A
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.
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).
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.
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).
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.
DS70592C-page 228
© 2011 Microchip Technology Inc.