PSD813F1 datasheet(32/120 Pages) STMICROELECTRONICS

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PSD813F1-A

Preliminary

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

Flash Protection Register

9.1.1.9.2 Reset Instruction

The Reset instruction resets the internal memory logic state machine in a few milliseconds.

Reset is an instruction of either one write operation or three write operations (refer to

Table 9).

Bit Definitions:

Sec_Prot

1 = Flash is write protected.

Sec_Prot

0 = Flash is not write protected.

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Security_

***

Sec3_Prot

Sec2_Prot

Sec1_Prot Sec0_Prot

Bit

PSD/EE Protection Register

Bit Definitions:

Sec_Prot

1 = EEPROM Boot Sector is write protected.

Sec_Prot

0 = EEPROM Boot Sector is not write protected.

Security_Bit

0 = Security Bit in device has not been set.

1 = Security Bit in device has been set.

Table 11. Sector Protection/Security Bit Definition

*: Not used.

The

PSD813F1

Functional

Blocks

(cont.)

9.1.1.8.4 Flash Erase Resume Instruction

If an Erase Suspend instruction was previously executed, the erase operation may be

resumed by this instruction. The Erase Resume instruction consists of writing 030h to any

address while an appropriate Chip Select (FSi) is true. (See Table 9.)

9.1.1.9 Flash and EEPROM Memory Specific Features

9.1.1.9.1 Flash and EEPROM Sector Protect

Each Flash and EEPROM sector can be separately protected against Program and Erase

functions. Sector Protection provides additional data security because it disables all

program or erase operations. This mode can be activated through the JTAG Port or a

Device Programmer.

Sector protection can be selected for each sector using the PSDsoft Configuration program.

This will automatically protect selected sectors when the device is programmed through

the JTAG Port or a Device Programmer. Flash and EEPROM sectors can be

unprotected to allow updating of their contents using the JTAG Port or a Device

Programmer. The microcontroller can read (but cannot change) the sector protection bits.

Any attempt to program or erase a protected Flash or EEPROM sector will be ignored by

the device. The Verify operation will result in a read of the protected data. This allows a

guarantee of the retention of the Protection status.

The sector protection status can be read by the MCU through the Flash protection and

PSD/EE protection registers (CSIOP). See Table 11.

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