UPSD325X datasheet(115/176 Pages) STMICROELECTRONICS

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µPSD325X DEVICES

– If a Reset Flash instruction is received, data in

the Flash memory sector that was being erased

is invalid.

Resume Sector Erase. If

Suspend

Sector

Erase instruction was previously executed, the

erase cycle may be resumed with this instruction.

The Resume Sector Erase instruction consists of

writing 030h to any address while an appropriate

Sector Select (FS0-FS7 or CSBOOT0-CSBOOT3)

is High. (See Table 85.)

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 regis-

ters (in the CSIOP block). See Table 87 and Table

88.

Table 87. 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 88. Sector Protection/Security Bit Definition – Secondary Flash 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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