DVR datasheet(44/416 Pages) MICROCHIP

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PIC24FJ256GA705 FAMILY

DS30010118D-page 44

 2016-2018 Microchip Technology Inc.

4.1.4

CODE-PROTECT CONFIGURATION

BITS

The device implements intermediate security features

defined by the FSEC register. The Boot Segment (BS)

is the higher privileged segment and the General Seg-

ment (GS) is the lower privileged segment. The total

user code memory can be split into BS or GS. The size

of the segments is determined by the BSLIM<12:0>

bits. The relative location of the segments within user

space does not change, such that BS (if present) occu-

pies the memory area just after the Interrupt Vector

Table (IVT) and the GS occupies the space just after

the BS (or if the Alternate IVT is enabled, just after it).

The Configuration Segment (CS) is a small segment

(less than a page, typically just one row) within user

Flash address space. It contains all user configuration

data that is loaded by the NVM Controller during the

Reset sequence.

4.1.5

CUSTOMER OTP MEMORY

PIC24FJ256GA705 family devices provide 256 bytes of

One-Time-Programmable (OTP) memory, located at

addresses, 801700h through 8017FEh. This memory

can be used for persistent storage of application-specific

information that will not be erased by reprogramming the

device. This includes many types of information, such as

(but not limited to):

• Application Checksums

• Code Revision Information

• Product Information

• Serial Numbers

• System Manufacturing Dates

• Manufacturing Lot Numbers

Customer OTP memory may be programmed in any

mode, including user RTSP mode, but it cannot be

erased. Data is not cleared by a chip erase.

Note:

Do not write the OTP memory more than

one time. Writing to the OTP memory

more than once may result in a permanent

ECC Double-Bit Error (ECCDBE) trap.

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