ST10F268 datasheet(15/74 Pages) STMICROELECTRONICS

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Table 6 : Error Code Definition (R0 content after STEAK execution)

Note: The Flash Embedded STEAK Algorithms

require at least 50 words on the Internal

System Stack for proper operation. The

program itself verifies that there is enough

free space on the System Stack before

performing a programming or erasing

operation, by computing the Word number

between Stack Pointer (SP) and Stack

Overflow register (STKOV ).

The MDH, MDL and MDC register content

are modified.

Registers R0 to R4 are used as Input Data

for STEAK, and are modified as explained

above (Return Values).

Registers R5 to R15 are used internally by

STEAK, but preserved on entry and

restore on exit of STEAK.

IT IS VERY IMPORTANT TO TAKE INTO

ACCOUNT

THE

FACT

THAT

STEAK

USES UP TO 50 WORDS ON THE SYS-

TEM

STACK.

PREVENT

ANY

ABNORMAL SITUATION, IT IS VERY

IMPORTANT

INITIALIZE

COR-

RECTLY THE STACK SIZE TO AT LEAST

64 WORDS, AND TO CORRECTLY INI-

TIALIZE REGISTER STKOV.

Error Code

Meaning

00h

Operation was successful

01h

Flash Protection is active

02h

Vpp voltage not present

03h

Programming operation failed

04h

Address value (R1) incorrect: not in Flash address area or odd

05h

CPU period out of range (must be between 30 ns to 500 ns)

06h

Not enough free space on system stack for proper operation

07h

Incorrect bank number (R2,R3) specified

08h

Erase operation failed (phase 1)

09h

Bad source address for Multiple Word programming command

0Ah

Bad number of words to be copied in Multiple Word programming command: one destination will be

out of flash.

0Bh

PLL Unlocked or Oscillator watchdog overflow occured during programming or erasing the flash.

0Ch

Erase operation failed (phase 2)

FFh

Unknown or bad command

Table 7 : Return values for each programming / erase command

Programming

Command

R4-R15

Single or

double Word

programming

Error

code

Unchanged

Data in Flash for

location Segment +

Segment

Offset

(R0.[3:0] with R1)

Data in Flash for

location Segment +

Segment Offset + 2

(R0[3:0] with R1+2)

Unchanged

Block

programming

Error

code

The last segment offset address of the

last written Word in Flash (failing Flash

address if R0 is not equal to zero)

Undefined

Unchanged

Erasing

Error

code

Undefined

Unchanged

After status

read

Error

code

Flash embedded rev

MSByte = major release

LSByte = minor revision

Circuit identifiers :

R2 = #0787h

R3 = #0101h for this device

Unchanged

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