PIC24HJ128GP206-I Datasheet, PDF (224/286 Pages) Microchip Technology – High-Performance, 16-Bit Microcontrollers

PIC24HJXXXGPX06/X08/X10
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.
Note:
Refer to CodeGuard Security Reference
Manual (DS70180) for further information
on usage, configuration and operation of
CodeGuard Security.
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.
DS70175F-page 222
© 2007 Microchip Technology Inc.