PSD854F2VA-12MI View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

PSD854F2VA-12MI

Flash in-system programmable (ISP) ipherals for 8-bit MCUs, 5 V

STMicroelectronics 

PSD8XXFX

Instructions

7.9

Error flag (DQ5)

During a normal program or erase cycle, the Error flag bit (DQ5) is to ’0.’ This bit is set to '1'

when there is a failure during Flash memory Byte Program, Sector Erase, or Bulk Erase

cycle.

In the case of Flash memory programming, the Error flag bit (DQ5) indicates the attempt to

program a Flash memory bit from the programmed state, ’0,’ to the erased state, '1,' which is

not valid. The Error flag bit (DQ5) may also indicate a timeout condition while attempting to

program a byte.

In case of an error in a Flash memory Sector Erase or Byte Program cycle, the Flash

memory sector in which the error occurred or to which the programmed byte belongs must

no longer be used. Other Flash memory sectors may still be used. The Error flag bit (DQ5)

is reset after a Reset Flash instruction.

Obsolete Product(s) - Obsolete Product(s) 7.10

Erase timeout flag (DQ3)

The Erase timeout flag bit (DQ3) reflects the timeout period allowed between two

consecutive Sector Erase instructions. The Erase timeout flag bit (DQ3) is reset to '0' after a

Sector Erase cycle for a time period of 100µs + 20% unless an additional Sector Erase

instruction is decoded. After this time period, or when the additional Sector Erase instruction

is decoded, the Erase timeout flag bit (DQ3) is set to '1.'

Doc ID 7833 Rev 7

33/128

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