PSD813F2 datasheet(38/128 Pages) STMICROELECTRONICS

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Erasing Flash memory

PSD8XXFX

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Doc ID 7833 Rev 7

Erasing Flash memory

9.1

Flash Bulk Erase

The Flash Bulk Erase instruction uses six WRITE operations followed by a READ operation

of the status register, as described in Table 10. If any byte of the Bulk Erase instruction is

wrong, the Bulk Erase instruction aborts and the device is reset to the Read Flash memory

status.

During a Bulk Erase, the memory status may be checked by reading the Error flag bit (DQ5),

the Toggle flag bit (DQ6), and the Data Polling flag bit (DQ7), as detailed in Section 8:

Programming Flash memory. The Error flag bit (DQ5) returns a '1' if there has been an

Erase Failure (maximum number of Erase cycles have been executed).

It is not necessary to program the memory with 00h because the PSD automatically does

this before erasing to 0FFh.

During execution of the Bulk Erase instruction, the Flash memory does not accept any

instructions.

9.2

Flash Sector Erase

The Sector Erase instruction uses six WRITE operations, as described in Table 10.

Additional Flash Sector Erase codes and Flash memory sector addresses can be written

subsequently to erase other Flash memory sectors in parallel, without further coded cycles,

if the additional bytes are transmitted in a shorter time than the timeout period of about

100µs. The input of a new Sector Erase code restarts the timeout period.

The status of the internal timer can be monitored through the level of the Erase timeout flag

bit (DQ3). If the Erase timeout flag bit (DQ3) is ’0,’ the Sector Erase instruction has been

received and the timeout period is counting. If the Erase timeout flag bit (DQ3) is '1,' the

timeout period has expired and the PSD is busy erasing the Flash memory sector(s). Before

and during Erase timeout, any instruction other than Suspend Sector Erase and Resume

Sector Erase instructions abort the cycle that is currently in progress, and reset the device

to READ mode. It is not necessary to program the Flash memory sector with 00h as the

PSD does this automatically before erasing (byte = FFh).

During a Sector Erase, the memory status may be checked by reading the Error flag bit

(DQ5), the Toggle flag bit (DQ6), and the Data Polling flag bit (DQ7), as detailed in

Section 8: Programming Flash memory.

During execution of the Erase cycle, the Flash memory accepts only Reset and Suspend

Sector Erase instructions. Erasure of one Flash memory sector may be suspended, in order

to read data from another Flash memory sector, and then resumed.

9.3

Suspend Sector Erase

When a Sector Erase cycle is in progress, the Suspend Sector Erase instruction can be

used to suspend the cycle by writing 0B0h to any address when an appropriate Sector

Select (FS0-FS7 or CSBOOT0-CSBOOT3) is high. (See Table 10). This allows reading of

data from another Flash memory sector after the Erase cycle has been suspended.

Suspend Sector Erase is accepted only during an Erase cycle and defaults to READ mode.

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