Datasheet

dsPIC33FJXXXMCX06/X08/X10
DS70287C-page 260 © 2009 Microchip Technology Inc.
23.5 JTAG Interface
dsPIC33FJXXXMCX06/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.
23.6 Code Protection and
CodeGuard™ Security
The dsPIC33FJXXXMCX06/X08/X10 devices offer the
advanced implementation 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 device implemented. The following sections
provide an overview of these features.
The code protection features are controlled by the
Configuration registers: FBS, FSS and FGS.
23.7 In-Circuit Serial Programming
dsPIC33FJXXXMCX06/X08/X10 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
customers 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
programmed. Please refer to the “dsPIC33F/PIC24H
Flash Programming Specification” (DS70152)
document for details about ICSP.
Any one out of three pairs of programming clock/data
pins may be used:
• PGEC1 and PGED1
• PGEC2 and PGED2
• PGEC3 and PGED3
23.8 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 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.
Note: Refer to Section 23. “CodeGuard™
Security” (DS70199) in the “dsPIC33F
Family Reference Manual” for further
information on usage, configuration and
operation of CodeGuard Security.