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AT32F413
Series Reference Manual
2022.06.27
Page 66
Rev 2.00
Note: The update of the contents in the user system data area becomes effective only after a
system reset.
Table 5-5
User system data area
Address
Bit
Description
0x1FFF_F800
[7: 0]
FAP[7: 0]: Flash memory access protection (Access protection enable/disable
result is stored in the FLASH_USD[1] register )
0xA5: Disabled
Others: Enabled
[15: 8]
nFAP[7: 0]: Inverse code of FAP[7: 0]
[23: 16]
SSB[7: 0]: System configuration byte (it is stored in the FLASH_USD[9: 2]
register)
Bit 7: 3
Reserved
Bit 2 (nSTDBY_RST)
0: Reset occurs when entering Standby mode
1: No reset occurs when entering Standby mode
Bit 1 (nDEPSLP_RST)
0: Reset occurs when entering Deepsleep mode
1: No reset occurs when entering Deepsleep
mode
Bit 0 (nWDT_ATO_EN)
0: Watchdog is enabled
1: Watchdog is disabled
[31: 24]
nSSB[7: 0]: Inverse code of SSB[7: 0]
0x1FFF_F804
[7: 0]
Data0[7: 0]: User data 0 (It is stored in the FLASH_USD[17:10] register)
[15: 8]
nData0[7: 0]: Inverse code of Data0[7: 0]
[23: 16]
Data1[7: 0]: User data 1 (It is stored in the FLASH_USD[25: 18] register)
[31: 24]
nData1[7: 0]: Inverse code of Data1[7: 0]
0x1FFF_F808
[7: 0]
EPP0[7: 0]: Flash erase/write protection byte 0 (in the FLASH_EPPS[7: 0]
)
For 256 K Flash memory, this field is used to protect page 0 ~page 15 of main
Flash memory. Each bit takes care of two pages (2 KB/page)
0: Erase/write protection is enabled
1: Erase/write protection is disabled
[15: 8]
nEPP0[7: 0]: Inverse code of EPP0[7: 0]
[23: 16]
EPP1[7: 0]: Flash erase/write protection byte 1 (stored in the FLASH_EPPS[15:
8])
For 256 K Flash memory, this field is used to protect page 16~page 31 of main
Flash memory. Each bit takes care of two pages (2 KB/page)
0: Erase/write protection is enabled
1: Erase/write protection is disabled
[31: 24]
nEPP1[7: 0]: Inverse code of EPP1[7: 0]
0x1FFF_F80C
[7: 0]
EPP2[7: 0]: Flash erase/write protection byte 2 (stored in the FLASH_EPPS[23:
16])
For 256 K Flash memory, this field is used to protect page 32~page 47 of main
Flash memory. Each bit takes care of two pages (2 KB/page)
0: Erase/write protection is enabled
1: Erase/write protection is disabled
[15: 8]
Inverse code of nEPP2[7: 0]: EPP2[7: 0]
[23: 16]
EPP3[7: 0]: Flash erase/write protection byte 3 (stored in the FLASH_EPPS[31:
24])
For 256 K Flash memory, bit 6:0 is used to protect page 48~page 61 of main
Flash memory. Each bit takes care of two pages (2 KB/page)
For 128 K and less, bit 6:0 is used to protect page 96~page 127 of main Flash
memory. Each bit takes care of four pages (1 KB/page)
Bit 7 is used to protect the remaining pages and external memory.
0: Erase/write protection is enabled
1: Erase/write protection is disabled
[31: 24]
nEPP3[7: 0]: Inverse code of EPP3[7: 0]
0x1FFF_F810
[7: 0]
EOPB0[7: 0]: Extended system options
Bit 7: 2: Reserved
Bit 1: 0:
0x0: 64 KB of SRAM
0x1: 16 KB of SRAM
0x2: 64 KB of SRAM
0x3: 32 KB of SRAM
.
[15: 8]
nEOPB0[7: 0]: Inverse code of EOPB0[7: 0]
[31: 16]
Reserved
0x1FFF_F814
[7: 0]
Data2[7: 0]: User data 2
[15: 8]
nData2[7: 0]: Inverse code of Data2[7: 0]
[23: 16]
Data3[7: 0]: User data 3