PSD813F2 datasheet(39/128 Pages) STMICROELECTRONICS

39 / 128 page

PSD8XXFX

Erasing Flash memory

Doc ID 7833 Rev 7

39/128

A Suspend Sector Erase instruction executed during an Erase timeout period, in addition to

suspending the Erase cycle, terminates the time out period.

The Toggle flag bit (DQ6) stops toggling when the PSD internal logic is suspended. The

status of this bit must be monitored at an address within the Flash memory sector being

erased. The Toggle flag bit (DQ6) stops toggling between 0.1µs and 15µs after the Suspend

Sector Erase instruction has been executed. The PSD is then automatically set to READ

mode.

If an Suspend Sector Erase instruction was executed, the following rules apply:

●

Attempting to read from a Flash memory sector that was being erased outputs invalid

data.

●

Reading from a Flash sector that was not being erased is valid.

●

The Flash memory cannot be programmed, and only responds to Resume Sector

Erase and Reset Flash instructions (READ is an operation and is allowed).

●

If a Reset Flash instruction is received, data in the Flash memory sector that was being

erased is invalid.

9.4

Resume Sector Erase

If a 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 10.)

PSD813F2 Datasheet(PDF) 39 Page - STMicroelectronics