ST STM32L0x3 Reference Manual page 90

Flash program memory and data EEPROM (FLASH)
Program half-page in Flash program memory
•
Purpose
Write one half page (16 words) in the Flash program memory.
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Size
Write only by word.
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Address
Select one address in the Flash program memory aligned to a half-page (for the first
address) and inside the same half-page selected by the second address for the next 15
addresses.
•
Protocol
Multiple programming operation.
•
Requests
PELOCK = 0, PRGLOCK = 0, FPRG = 1, PRG = 1.
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Errors
WRPERR is set to 1 if PELOCK = 1 or PRGLOCK = 1. WRPERR is set to 1 if the user
tries to write in a write-protected sector (see the
Protection)
NOTZEROERR is set to 1 if the user tries to write a value in a word which is not zero.
This error does not stop the write operation on category 3 devices while the operation
is stopped on other categories. The check is done when all 16 addresses have been
received, before the current write phase in Flash memory. The error flags are set only
when all checks are performed.
SIZERR is set to 1 if the size is not the word.
PGAERR is set to 1 if the first address is not aligned to a half-page and if one of the
following addresses (address from 2 to 16) is outside the half-page determined by the
first address. No check is done to verify if the address has increased or if it has
changed: this is done automatically by the memory interface. What is important is that
the first address is aligned to the half-page, and that the next addresses are in the
same half-page.
FWWERR is set to 1 if the write is aborted because the master fetched in the NVM.
The read as data does not stop the write operation.
•
Description
This operation allows writing a half-page in Flash program memory. The user must
write the 16 desired values at the right address with a word size (as explained in the
multiple programming operation). The memory interface cannot execute an erase to
delete the previous content before writing (the user must delete the page before
writing).
As for the single programming operation, if the previous content is not null:
–
90/1043
section).
Category 3 devices
NOTZEROERR is set to 1.
The written value is the OR of previous and new data. This means that reading
back the written address may return a value which is different from the written one.
PcROP (Proprietary Code Read-Out
RM0367 Rev 7
RM0367