Hi, RBG,
the RM0434 describes the usage of the internal Flash memory. Section 3.3.8 provides useful information on the size of the data that can be written, e.g.:
The Flash memory is programmed 72 bits (a double word, 64 bits plus ECC, 8 bits) at a time.
Programming in a previously programmed double word is only allowed when programming an all 0 value. It is not allowed to program any other value in a previously programmed double word, any attempt sets PROGERR flag in the Flash memory status register (FLASH_SR) or Flash memory CPU2 status register (FLASH_C2SR), except when programming an already programmed double word with an all 0 value.
It is only possible to program a double word (2 x 32-bit data).
- Any attempt to write byte (8 bits) or half-word (16 bits) sets SIZERR flag in the FLASH_xxSR register.
- Any attempt to write a double word that is not aligned with a double word address sets PGAERR flag in the FLASH_xxSR register.
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/Peter
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