ST92F250CV2 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST92F250CV2

8/16-bit single voltage Flash MCU family with RAM, E³ TM (emulated EEPROM), CAN 2.0B and J1850 BLPD

STMicroelectronics 

Single voltage Flash and E3™ (emulated EEPROM)

7.3.2

Status registers

Two Status Registers (FESR[1:0] are available to check the status of the current write

operation in Flash and E3 TM memories.

During a Flash or an E3 TM write operation any attempt to read the memory under modification

will output invalid data (FFh equivalent to a NOP instruction). This means that the Flash

memory is not fetchable when a write operation is active: the write operation commands

must be given from another memory (E3 TM, internal RAM, or external memory).

FLASH & E3 TM STATUS REGISTER 0 (FESR0)

Address: 224002h /221002h -Read/Write

Reset value: 0000 0000 (00h)

7

6

5

4

3

FEERR FESS6 FESS5 FESS4 FESS3

2

FESS2

1

FESS1

0

FESS0

Bit 7 = FEERR: Flash or E3 TM write ERRor (Read/Write).

This bit is set by hardware when an error occurs during a Flash or an E3 TM write operation. It

must be cleared by software.

0: Write OK

1: Flash or E3 TM write error

Bit 6:0 = FESS[6:0]. Flash and E3 TM Sectors Status Bits (Read Only).

These bits are set by hardware and give the status of the 7 Flash and E3 TM sectors.

● FESS6 = TestFlash and OTP

● FESS5:4 = E3 TM sectors

For 128K and 64K Flash devices:

● FESS3:0 = Flash sectors (F3:0)

For the ST92F250 (256K):

● FESS3 gives the status of F5, F4 and F3 sectors: the status of all these three sectors

are ORed on this bit

● FESS2:0 = Flash sectors (F2:0)

The meaning of the FESSx bit for sector x is given in Table 12.

Table 12. Sector status bits

FEERR

FBUSY

EBUSY

FSUSP

FESSx=1 meaning

1

-

-

Write Error in Sector x

0

1

-

Write operation on-going in sector x

0

0

1

Sector Erase Suspended in sector x

0

0

0

Don’t care

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Doc ID 8848 Rev 7

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