ST10F280-JT3 View Datasheet(PDF) - STMicroelectronics

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ST10F280-JT3

16-BIT MCU WITH MAC UNIT, 512K BYTE FLASH MEMORY AND 18K BYTE RAM

STMicroelectronics 

ST10F280

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

SXCT DPPO, #08h

MOV R7, #0A8h

MOV [R5], R7

MOV R7, #054h

MOV [R6], R7

MOV R7, #080h

MOV [R5], R7

MOV R7, #0A8h

MOV [R5], R7

MOV R7, #054h

MOV [R6], R7

POP DPP0

MOV R7, #030h

EXTS R11, #1

MOV [R12], R7

Erase_Polling:

EXTS R11, #1

MOV R7, [R12]

JB R7.7, Erase_OK

;load auxilary register R6 with command address

;(used in command cycle 2)

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

;segment 2

;load register R7 with 1st CI enable command

;command cycle 1

;load register R7 with 2cd CI enable command

;command cycle 2

;load register R7 with Block Erase command

;command cycle 3

;load register R7 with 1st CI enable command

;command cycle 4

;load register R7 with 2cd CI enable command

;command cycle 5

;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

;load register R7 with erase confirm code

;use EXTended addressing for next MOV instruction

;command cycle 6: the EPC starts execution of

;Erasing Command

;use EXTended addressing for next MOV instruction

;read Flash Status register (FSB) in R7

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

JNB R7.5, Erase_Polling

Erase_Error:

MOV R7, #0F0h

EXTS R11, #1

MOV [R12], R7

...

...

...

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

;Programming failed: Flash remains in Write

;Operation.

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

;command

;must be performed

;load register R7 with Read/Reset command

;use EXTended addressing for next MOV instruction

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

;here place specific Error handling code

Erase_OK:

....

....

;When erasing operation finished succesfully,

;Flash is set back automatically to normal Read Mode

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