Datasheet

dsPIC33FJXXXGPX06A/X08A/X10A
DS70593D-page 258  2009-2012 Microchip Technology Inc.
22.5 JTAG Interface
dsPIC33FJXXXGPX06A/X08A/X10A devices imple-
ment 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.
22.6 Code Protection and
CodeGuard™ Security
The dsPIC33F product families 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 dsPIC33F implemented. The following
sections provide an overview of these features.
The code protection features are controlled by the
Configuration registers: FBS, FSS and FGS.
22.7 In-Circuit Serial Programming
dsPIC33FJXXXGPX06A/X08A/X10A family digital sig-
nal 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
22.8 In-Circuit Debugger
When MPLAB
®
ICD 3 is selected as a debugger, the
in-circuit debugging functionality is enabled. This
function 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 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: Refer to Section 23. “CodeGuard™
Security” (DS70199) in the “dsPIC33F/
PIC24H Family Reference Manual” for fur-
ther information on usage, configuration
and operation of CodeGuard™ Security.