AN1528 datasheet(13/18 Pages) STMICROELECTRONICS

13 / 18 page

13/18

ST92F120/F124/150/F250 TESTFLASH

3.5.3 Complete Aborted Swap (23002Fh)

Inputs: None.

Outputs: R0.

Variables: R192-R223 (for Stack).

Goal: complete the aborted Swap Phase after a Swap fail.

This routine has to be called by the User application if after an E3TM write operation the bits

FEERR of FESR0 (224002h) and SWER of FESR1 (224003h) are set. After having executed

the “Find Wrong Pages routine” and the “Find Wrong Bytes routine”, and after having stored in

Ram the E3TM addresses and data to program again, this routine can be called through a far

call:

CALLS

23h, 002Fh

;Complete Swap

This routine performs the following operations:

■

perform a Sector Erase operation on the old sector;

■

during the Sector Erase operation, a User routine is called toy refresh an external Watchdog

if necessary. 3.7 User routine for External Watchdog Refresh for details.

■

write the VCSS1 register (222003h) with the sector number currently mapping the E3TM

data;

■

write the VCSS0 register (222001h) with the number of the last completed Erase Phase on

the complementary sector;

The User Application should check the Output variable of the Complete Swap routine:

A4h), or if has failed (Bad Code: 40h).

Byte 8h+X OK

Byte 8h+X Wrong

Byte Fh OK

Byte Fh Wrong

Table 5. Wrong Bytes Output Meaning

Reg

Bit

0 Meaning

1 Meaning

AN1528 Datasheet(PDF) 13 Page - STMicroelectronics