PIC24F16KL402 Datasheet, PDF (185/260 Pages) Microchip Technology – Low-Power, Low-Cost, General Purpose 16-Bit Flash Microcontrollers with nanoWatt XLP Technology

PIC24F16KL402 FAMILY
23.4 Program Verification and
Code Protection
For all devices in the PIC24F16KL402 family, code
protection for the boot segment is controlled by the
BSS<2:0> Configuration bits and the general segment
by the Configuration bit, GSS0. These bits inhibit exter-
nal reads and writes to the program memory space
This has no direct effect in normal execution mode.
Write protection is controlled by bit, BWRP, for the boot
segment and bit, GWRP, for the general segment in the
Configuration Word. When these bits are programmed
to ‘0’, internal write and erase operations to program
memory are blocked.
23.5 In-Circuit Serial Programming
PIC24F16KL402 family microcontrollers can be serially
programmed while in the end application circuit. This is
simply done with two lines for clock (PGECx) and data
(PGEDx), and three other lines for power, ground and
the programming voltage. This allows customers to
manufacture boards with unprogrammed devices and
then program the microcontroller just before shipping
the product. This also allows the most recent firmware
or a custom firmware to be programmed.
23.6 In-Circuit Debugger
When MPLAB^® ICD 3, MPLAB REAL ICE™ or
PICkit™ 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 and PGEDx pins.
To use the in-circuit debugger function of the device,
the design must implement ICSP connections to
MCLR, VDD, VSS, PGECx, PGEDx and the 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.
 2011 Microchip Technology Inc.
DS31037B-page 185