ST10F280_12 datasheet(46/239 Pages) STMICROELECTRONICS

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Internal Flash memory

ST10F280

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Doc ID 8673 Rev. 3

;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’)

JB 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:

....

5.6

Bootstrap loader

The built-in bootstrap loader (BSL) of the ST10F280 provides a mechanism to load the

startup program through the serial interface after reset. In this case, no external memory or

internal Flash memory is required for the initialization code starting at location 00’0000h

(see Figure 5).

The bootstrap loader moves code/data into the internal RAM, but can also transfer data via

the serial interface into an external RAM using a second level loader routine. ROM Memory

(internal or external) is not necessary, but it may be used to provide lookup tables or “core-

code” like a set of general purpose subroutines for I/O operations, number crunching,

system initialization, etc.

The bootstrap loader can be used to load the complete application software into ROMless

systems, to load temporary software into complete systems for testing or calibration, or to

load a programming routine for Flash devices.

The BSL mechanism can be used for standard system startup as well as for special

occasions like system maintenance (firmer update) or end-of-line programming or testing.

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