PSD913F2 datasheet(30/94 Pages) STMICROELECTRONICS

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The

PSD9XX

Functional

Blocks

(cont.)

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 – PSD913F2

The Reset instruction consists of one write cycle (see Table 9). It can also be optionally

preceded by the standard two write decoding cycles (writing AAh to 555h and 55h to

AAAh).

The Reset instruction must be executed after:

1. Reading the Flash Protection status or Flash ID

2. When an error condition occurs (DQ5 goes high) during a Flash programming or erase

cycle.

The Reset instruction will reset the Flash to normal Read Mode. It may take the Flash

memory up to few msec to complete the reset cycle.

The Reset instruction is ignored when it is issued during a Flash programming or Bulk

Erase cycle. During Sector Erase cycle, the Reset instruction will abort the on going sector

erase cycle and return the Flash to normal Read Mode in up to few msec.

9.1.1.9.3 Reset Instruction – PSD934F2, PSD954F2

The Reset instruction consists of one write cycle (see Table 9). It can also be optionally

preceded by the standard two write decoding cycles (writing AAh to 555h and 55h to

AAAh).

The Reset instruction must be executed after:

1. Reading the Flash Protection status or Flash ID

2. When an error condition occurs (DQ5 goes high) during a Flash programming or erase

cycle.

The Reset instruction will immediately reset the Flash to normal Read Mode. However,

if there is an error condition (DQ5 goes high), the Flash memory will return to the Read

Mode in 25 µsec after the Reset instruction is issued.

The Reset instruction is ignored when it is issued during a Flash programming or Bulk

Erase cycle. The Reset instruction will abort the on going sector erase cycle and return the

Flash memory to normal Read Mode in 25 µsec.

Bit Definitions:

Sec_Prot

1 = Main Flash Sector is write protected.

Sec_Prot

0 = Main Flash Sector 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

Secondary Flash Protection Register

Bit Definitions:

Sec_Prot

1 = Secondary Flash Sector is write protected.

Sec_Prot

0 = Secondary Flash 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.

PSD9XX Family

Preliminary Information

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