DSPIC33F datasheet(62/80 Pages) MICROCHIP

62 / 80 page

dsPIC33F/PIC24H PROGRAMMING SPECIFICATION

DS70152D-page 62

Preliminary

5.7

Writing Configuration Memory

The 8-bit Configuration registers are programmable, one

ommended for the Configuration registers are shown in

Table 5-6 and Table 5-7. The recommended default

FOSCSEL value is 0x07, which selects the FRC clock

oscillator setting.

The FBS, FSS and FGS Configuration registers are

special since they enable code protection for the

device. For security purposes, once any bit in these

registers is programmed to ‘0’ (to enable code protec-

tion), it can only be set back to ‘1’ by performing a Bulk

Erase as described in Section 5.5 “Erasing Program

Memory”. Programming any of these bits from a ‘0’ to

‘1’ is not possible, but they may be programmed from a

‘1’ to a ‘0’ to enable code protection.

Table 5-8 shows the ICSP programming details for clear-

ing the Configuration registers. In Step 1, the Reset vec-

tor is exited. In Step 2, the write pointer (W7) is loaded

with 0x0000, which is the original destination address (in

TBLPAG, 0xF8 of program memory). In Step 3, the

NVMCON is set to program one Configuration register.

In Step 4, the TBLPAG register is initialized to 0xF8 for

writing to the Configuration registers. In Step 5, the value

to write to each Configuration register is loaded to W0.

In Step 6, the Configuration register data is written to the

write latch using the TBLWTL instruction. In Steps 7 and

8, the programming cycle is initiated. In Step 9, the inter-

nal PC is set to 0x200 as a safety measure to prevent the

PC from incrementing into unimplemented memory.

Lastly, Steps 4-9 are repeated until all twelve

Configuration registers are written.

TABLE 5-6:

DEFAULT CONFIGURATION

dsPIC33FJ12GP201/202,

dsPIC33FJ12MC201/202 AND

PIC24HJ12GP201/202

TABLE 5-7:

DEFAULT CONFIGURATION

OTHER DEVICES

Address

Name

Default Value

0xF80000

FBS

0xCF

0xF80002

FSS

0xFF

0xF80004

FGS

0x07

0xF80006

FOSCSEL

0xA7

0xF80008

FOSC

0xE7

0xF8000A

FWDT

0xDF

0xF8000C

FPOR

0xF7

0xF8000E

FICD

0xE3

0xF80010

FUID0

0xFF

0xF80012

FUID1

0xFF

0xF80014

FUID2

0xFF

0xF80016

FUID3

0xFF

Address

Name

Default Value

0xF80000

FBS

0xCF

0xF80002

FSS

0xCF

0xF80004

FGS

0x07

0xF80006

FOSCSEL

0xA7

0xF80008

FOSC

0xC7

0xF8000A

FWDT

0xDF

0xF8000C

FPOR

0xE7

0xF8000E

FICD

0xE3

0xF80010

FUID0

0xFF

0xF80012

FUID1

0xFF

0xF80014

FUID2

0xFF

0xF80016

FUID3

0xFF

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