GigaDevice Semiconductor GD32VF103 - Option Byte Unlock Key Register (FMC_OBKEY); Status Register (FMC_STAT)

GD32VF103 User Manual
42
Bits
Fields
Descriptions
31:0
KEY[31:0]
FMC_CTL unlock key
These bits are only be written by software. Write KEY[31:0] with keys to unlock
FMC_CTL register
2.4.3. Option byte unlock key register (FMC_OBKEY)
Address offset: 0x08
Reset value: 0x0000 0000
This register has to be accessed by word (32-bit)
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
OBKEY[31:16]
w
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
OBKEY[15:0]
w
Bits
Fields
Descriptions
31:0
OBKEY[31:0]
FMC_CTL option bytes operation unlock key
These bits are only be written by software. Write OBKEY[31:0] with keys to unlock
option bytes command in FMC_CTL register.
2.4.4. Status register (FMC_STAT)
Address offset: 0x0C
Reset value: 0x0000 0000
This register has to be accessed by word (32-bit)
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Reserved
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Reserved
ENDF
WPERR
Reserved
PGERR
Reserved
BUSY
rc_w1
rc_w1
rc_w1
r
Bits
Fields
Descriptions
31:6
Reserved
Must be kept at reset value.
5
ENDF
End of operation flag bit
When the operation executed successfully, this bit is set by hardware. The software
can clear it by writing 1.
4
WPERR
Erase/Program protection error flag bit