ST10F280_12 datasheet(44/239 Pages) STMICROELECTRONICS

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Internal Flash memory

ST10F280

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Doc ID 8673 Rev. 3

Example 2: Performing a Program Word command

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

have been mapped to segment 1.The data to be written is loaded in register R13, the

address to be programmed is loaded in register R11/R12 (segment number in R11,

segment offset in R12).

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, #0A0h

;load register R7 with Program Word command

MOV [R5], R7

;command cycle 3

POP DPP0

;restore DPP0: following addressing to the Flash

;will use EXTended instructions

;R11 contains the segment to be programmed

;R12 contains the segment offset address to be

;programmed

;R13 contains the data to be programmed

EXTS R11, #1

;use EXTended addressing for next MOV instruction

MOV [R12], R13

;command cycle 4: the EPC starts execution of

;Programming Command

Data_Polling:

EXTS R11, #1

;use EXTended addressing for next MOV instruction

MOV R7, [R12]

;read Flash Status register (FSB) in R7

MOV R6, R7

;save it in R6 register

;Check if FSB.7 = Data.7 (i.e. R7.7 = R13.7)

XOR R7, R13

JNB R7.7, Prog_OK

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

JNB R6.5, Data_Polling

;Programming Error: verify is Flash programmed

;data is OK

EXTS R11, #1

;use EXTended addressing for next MOV instruction

MOV R7, [R12]

;read Flash Status register (FSB) in R7

;Check if FSB.7 = Data.7

XOR R7, R13

JNB R7.7, Prog_OK

;Programming failed: Flash remains in Write

;Operation.

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

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