ST10 datasheet(12/58 Pages) STMICROELECTRONICS

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ST10F163

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The Flash Unlock Sequence consists of two con-

secutive writes: the direct addressing mode and

the indirect addressing mode. The FCR must rep-

resent an even address in the active address

space of the flash memory. Rwn can be any

unused word GPR (R6 to R15), loaded with a

value that results in the same even address as for

FCR

For easier coding, the standard data paging

addressing scheme is overridden for the two MOV

instruction of the Flash Trigger Sequence (EXTS

instruction). This also locked both standard and

PEC interrupts and class A hardware traps. Must

be replace by ATOMIC instruction if standard DPP

addressing scheme must be preserved.

When the embedded programming/erasing algo-

rithm returns to trigger point, information can be

collected through register R0 so the user can take

specific actions. Table 5 lists all of the error codes

that can be returned in R0.

Note

The Flash Embedded Presto Algorithms require at least 45 words on the Internal System Stack for proper operation. The program

verifies itself that there is enough free space on the System Stack before performing a programming or erasing operation (by

comparing SP value with STK OV+90d).

EXTS

#1, #2

; assumes flash is

mapped in seg 1

MOV

FCR, R7

; first part

MOV

[R7], R7

; second part

Table 5 : Error code definition

ERROR CODE

MEANING

00h

Operation was successful

01h

ROMEN bit inside SYSCON is not set

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 10 ns to 1000 ns)

06h

Not enough free space on system stack for proper operation

07h

Incorrect bank number (R2,R3) specified

08h

Erase operation failed

09h

Bad source address for multi-word programming command

0Ah

Bad number of words to be copied in multi-word programming command: one

destination will be out of flash, or one source operand will be out of the source page

FFh

Unknown or bad command

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