PSD834F2V datasheet(22/89 Pages) STMICROELECTRONICS

22 / 89 page

PSD834F2V

22/89

Specific Features

Flash Memory Sector Protect. Each

primary

and secondary Flash memory sector can be sepa-

rately protected against Program and Erase cy-

cles. Sector Protection provides additional data

security because it disables all Program or Erase

cycles. This mode can be activated through the

JTAG Port or a Device Programmer.

Sector protection can be selected for each sector

using the PSDsoft Express Configuration pro-

gram. This automatically protects selected sectors

when the device is programmed through the JTAG

Port or a Device Programmer. Flash memory sec-

tors can be unprotected to allow updating of their

contents using the JTAG Port or a Device Pro-

grammer. The MCU can read (but cannot change)

the sector protection bits.

Any attempt to program or erase a protected Flash

memory sector is ignored by the device. The Verify

operation results in a read of the protected data.

This allows a guarantee of the retention of the Pro-

tection status.

The sector protection status can be read by the

MCU through the Flash memory protection and

PSD/EE protection registers (in the CSIOP block).

See Table 9 and Table 10.

Table 9. Sector Protection/Security Bit Definition – Flash Protection Register

Note: 1. Bit Definitions:

Sec_Prot 1 = Primary Flash memory or secondary Flash memory Sector is write protected.

Sec_Prot 0 = Primary Flash memory or secondary Flash memory Sector is not write protected.

Table 10. Sector Protection/Security Bit Definition – PSD/EE Protection Register

Note: 1. Bit Definitions:

Sec_Prot 1 = Secondary Flash memory Sector is write protected.

Sec_Prot 0 = Secondary Flash memory Sector is not write protected.

Security_Bit 0 = Security Bit in device has not been set.

1 = Security Bit in device has been set.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Sec7_Prot

Sec6_Prot

Sec5_Prot

Sec4_Prot

Sec3_Prot

Sec2_Prot

Sec1_Prot

Sec0_Prot

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Security_Bit

not used

Sec3_Prot

Sec2_Prot

Sec1_Prot

Sec0_Prot

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