ST10F280 datasheet(33/186 Pages) STMICROELECTRONICS

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ST10F280

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Example 3 Performing the Block Erase command

We assume that in the initialization phase the lowest 32K Bytes of Flash memory (sector 0) have been

mapped to segment 1.The registers R11/R12 contain an address related to the block to be erased

(segment number in R11, segment offset in R12, for example R11 = 01h, R12= 4000h will erase the block

1 first 8K byte block).

MOV

R5, #01554h

;load auxilary register R5 with command address

;(used in command cycle 1)

MOV

R6, #02AA8h

;load auxilary register R6 with command address

;(used in command cycle 2)

SXCT

DPPO, #08h

;push data page pointer 0 and load it to point ;to

;segment 2

MOV

R7, #0A8h

;load register R7 with 1st CI enable command

MOV

[R5], R7

;command cycle 1

MOV

R7, #054h

;load register R7 with 2cd CI enable command

MOV

[R6], R7

;command cycle 2

MOV

R7, #080h

;load register R7 with Block Erase command

MOV

[R5], R7

;command cycle 3

MOV

R7, #0A8h

;load register R7 with 1st CI enable command

MOV

[R5], R7

;command cycle 4

MOV

R7, #054h

;load register R7 with 2cd CI enable command

MOV

[R6], R7

;command cycle 5

POP

DPP0

;restore DPP0: following addressing to the Flash

;will use EXTended instructions

;R11 contains the segment of the block to be erased

;R12 contains the segment offset address of the

;block to be erased

MOV

R7, #030h

;load register R7 with erase confirm code

EXTS

R11, #1

;use EXTended addressing for next MOV instruction

MOV

[R12], R7

;command cycle 6: the EPC starts execution of

;Erasing Command

Erase_Polling:

EXTS

R11, #1

;use EXTended addressing for next MOV instruction

MOV

R7, [R12]

;read Flash Status register (FSB) in R7

;Check if FSB.7 = ‘1’ (i.e. R7.7 = ‘1’)

R7.7, Erase_OK

;Check if FSB.5 = 1 (Erasing Error)

JNB

R7.5, Erase_Polling

;Programming failed: Flash remains in Write

;Operation.

;To go back to normal Read operations, a Read/Reset

;command

;must be performed

Erase_Error:

MOV

R7, #0F0h

;load register R7 with Read/Reset command

EXTS

R11, #1

;use EXTended addressing for next MOV instruction

MOV

[R12], R7

;address is don’t care for Read/Reset command

...

;here place specific Error handling code

...

;When erasing operation finished succesfully,

;Flash is set back automatically to normal Read Mode

Erase_OK:

....

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