ARTERY AT32F421C8T7 - Programming Operation; Figure 5-5 System Data Area Programming Process

AT32F421 Series Reference Manual
2022.11.11 Page 68 Rev 2.02
5.4.3 Programming operation
The User system data area can be programmed with 16-bit or 32-bit data at one time.
The following process is recommended:
 Check that no Flash memory operation is ongoing by checking the OBF bit in the FLASH_STS
register
 Set the USDPRGM bit in the FLASH_CTRL register, so that the programming instructions for the
user system data area can be received;
 Write the data (half-word/word) to be programmed to the designated address;
 Wait until the OBF bit in the FLASH_STS register becomes “0”, read the PRGMERR and ODF bit
to verify
Note: Read operation to the Flash memory during programming halts CPU until the completion of
programming. The internal HICK must be enabled prior to programming operation.
Figure 5-5 System data area programming process
OBF = 0?
Set the USDPRGM bit = 1 in
FLASH_CTRL
Write word/half-word
(32bits/16 bits) data
No
Yes
Start
Check the OBF bit in
FLASH_STS
No
Check the OBF bit in
FLASH_STS
OBF = 0?
Yes
Read PRGMERR bit and ODF bit
in FLASH_STS
End