PIC24F16KA102 datasheet(199/254 Pages) MICROCHIP

199 / 254 page

Preliminary

DS39927B-page 197

PIC24F16KA102 FAMILY

26.3

Deep Sleep Watchdog Timer

(DSWDT)

In PIC24F16KA102 family devices, in addition to the

WDT module, a DSWDT module is present which runs

while the device is in Deep Sleep, if enabled. It is

driven by either the SOSC or LPRC oscillator. The

clock source is selected by the Configuration bit,

DSWCKSEL (FDS<4>).

The DSWDT can be configured to generate a time-out

at 2.1 ms to 25.7 days by selecting the respective

postscaler. The postscaler can be selected by the

Configuration bits, DSWDTPS<3:0> (FDS<3:0>).

When the DSWDT is enabled, the clock source is also

enabled.

DSWDT is one of the sources that can wake-up the

device from Deep Sleep mode.

26.4

Program Verification and

Code Protection

For all devices in the PIC24F16KA102 family, code

protection for the boot segment is controlled by the

Configuration bit, BSS0, and the general segment by

the Configuration bit, GSS0. These bits inhibit external

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.

26.5

In-Circuit Serial Programming

PIC24F16KA102 family microcontrollers can be

serially programmed while in the end application circuit.

This is simply done with two lines for clock (PGCx) and

data (PGDx) 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.

26.6

In-Circuit Debugger

When MPLAB® ICD 2 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 EMUCx (Emulation/Debug Clock) and

EMUDx (Emulation/Debug Data) pins.

To use the in-circuit debugger function of the device,

the design must implement ICSP connections to

MCLR,

VDD,

VSS,

PGCx,

PGDx

and

the

EMUDx/EMUCx 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.

PIC24F16KA102 Datasheet(PDF) 199 Page - Microchip Technology

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