PSD833F2 datasheet(40/128 Pages) STMICROELECTRONICS

40 / 128 page

Specific features

PSD8XXFX

40/128

Doc ID 7833 Rev 7

Specific features

10.1

Flash Memory Sector Protect

Each primary and secondary Flash memory sector can be separately protected against

Program and Erase cycles. 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

program. This automatically protects selected sectors when the device is programmed

through the JTAG port or a device programmer. Flash memory sectors can be unprotected

to allow updating of their contents using the JTAG port or a device programmer. 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 Protection 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 12 and Table 13.

10.2

Reset Flash

The Reset Flash instruction consists of one WRITE cycle (see Table 10). It can also be

optionally preceded by the standard two WRITE decoding cycles (writing AAh to 555h and

55h to AAAh). It must be executed after:

●

Reading the Flash Protection Status or Flash ID

●

An Error condition has occurred (and the device has set the Error flag bit (DQ5) to '1')

during a Flash memory program or erase cycle.

On the PSD813F2/3/4/5, the Reset Flash instruction puts the Flash memory back into

normal READ mode. It may take the Flash memory up to a few milliseconds to complete the

Reset cycle. The Reset Flash instruction is ignored when it is issued during a Program or

Bulk Erase cycle of the Flash memory. The Reset Flash instruction aborts any on-going

Sector Erase cycle, and returns the Flash memory to the normal READ mode within a few

milliseconds.

On the PSD83xF2 or PSD85xF2, the Reset Flash instruction puts the Flash memory back

into normal READ mode. If an Error condition has occurred (and the device has set the

Error flag bit (DQ5) to '1') the Flash memory is put back into normal READ mode within 25

μs

of the Reset Flash instruction having been issued. The Reset Flash instruction is ignored

when it is issued during a Program or Bulk Erase cycle of the Flash memory. The Reset

Flash instruction aborts any on-going Sector Erase cycle, and returns the Flash memory to

the normal READ mode within 25

μs.

Obsolete

Product(s)

- Obsolete

Product(s)

PSD833F2 датащи(PDF) 40 Page - STMicroelectronics

PSD833F2 датащи(HTML) 40 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

датащи скачать

ссылки URL