PIC24FJ128GA310 datasheet(333/406 Pages) MICROCHIP

333 / 406 page

 2010-2011 Microchip Technology Inc.

DS39996F-page 333

PIC24FJ128GA310 FAMILY

29.0

SPECIAL FEATURES

PIC24FJ128GA310 family devices include several

features intended to maximize application flexibility and

reliability, and minimize cost through elimination of

external components. These are:

• Flexible Configuration

• Watchdog Timer (WDT)

• Code Protection

• JTAG Boundary Scan Interface

• In-Circuit Serial Programming™

• In-Circuit Emulation

29.1

Configuration Bits

The Configuration bits can be programmed (read as ‘0’),

or left unprogrammed (read as ‘1’), to select various

device configurations. These bits are mapped starting at

program memory location, F80000h. A detailed explana-

tion of the various bit functions is provided in

Note that address, F80000h, is beyond the user program

memory space. In fact, it belongs to the configuration

memory space (800000h-FFFFFFh) which can only be

accessed using table reads and table writes.

29.1.1

CONSIDERATIONS FOR

CONFIGURING PIC24FJ128GA310

FAMILY DEVICES

In PIC24FJ128GA310 family devices, the configuration

bytes are implemented as volatile memory. This means

that configuration data must be programmed each time

the device is powered up. Configuration data is stored

in the three words at the top of the on-chip program

memory space, known as the Flash Configuration

Words. Their specific locations are shown in

Table 29-1. These are packed representations of the

actual device Configuration bits, whose actual

locations are distributed among several locations in

configuration space. The configuration data is automat-

ically loaded from the Flash Configuration Words to the

proper Configuration registers during device Resets.

When creating applications for these devices, users

should always specifically allocate the location of the

Flash Configuration Word for configuration data. This is

to make certain that program code is not stored in this

address when the code is compiled.

The upper byte of all Flash Configuration Words in pro-

gram memory should always be ‘0000 0000’. This

makes them appear to be NOP instructions in the

remote event that their locations are ever executed by

accident. Since Configuration bits are not implemented

in the corresponding locations, writing ‘0’s to these

locations has no effect on device operation.

TABLE 29-1:

FLASH CONFIGURATION WORD LOCATIONS FOR PIC24FJ128GA310 FAMILY

DEVICES

Note:

This data sheet summarizes the features of

this group of PIC24F devices. It is not

intended to be a comprehensive reference

source. For more information, refer to the

following sections of the “PIC24F Family

Reference Manual

”. The information in this

data sheet supersedes the information in

the FRMs.

• Section 9. “Watchdog Timer (WDT)”

(DS39697)

• Section 32. “High-Level Device

Integration”

(DS39719)

• Section 33. “Programming and

Diagnostics”

(DS39716)

Note:

Configuration data is reloaded on all types

of device Resets.

Note:

Performing a page erase operation on the

last page of program memory clears the

Flash Configuration Words, enabling code

protection as a result. Therefore, users

should avoid performing page erase

operations on the last page of program

memory.

Device

Configuration Word Addresses

1234

PIC24FJ64GA3XX

ABFEh

ABFCh

ABFAh

ABF8h

PIC24FJ128GA3XX

157FEh

157FCh

157FAh

157F8h

PIC24FJ128GA310 Datasheet(PDF) 333 Page - Microchip Technology

PIC24FJ128GA310 Datasheet(HTML) 333 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL