RM0008 Backup registers (BKP)
Doc ID 13902 Rev 12 83/1096
6.4.5 BKP register map
BKP registers are mapped as 16-bit addressable registers as described in the table below:
Bit 8 TEF: Tamper event flag
This bit is set by hardware when a Tamper event is detected. It is cleared by writing 1 to the
CTE bit.
0: No Tamper event
1: A Tamper event occurred
Note: A Tamper event resets all the BKP_DRx registers. They are held in reset as long as the
TEF bit is set. If a write to the BKP_DRx registers is performed while this bit is set, the
value will not be stored.
Bits 7:3 Reserved, always read as 0.
Bit 2 TPIE: TAMPER pin interrupt enable
0: Tamper interrupt disabled
1: Tamper interrupt enabled (the TPE bit must also be set in the BKP_CR register
Note: 1: A Tamper interrupt does not wake up the core from low-power modes.
2: This bit is reset only by a system reset and wakeup from Standby mode.
Bit 1 CTI: Clear tamper interrupt
This bit is write only, and is always read as 0.
0: No effect
1: Clear the Tamper interrupt and the TIF Tamper interrupt flag.
Bit 0 CTE: Clear tamper event
This bit is write only, and is always read as 0.
0: No effect
1: Reset the TEF Tamper event flag (and the Tamper detector)
Table 17. BKP register map and reset values
Offset Register
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0x00 Reserved
0x04
BKP_DR1
Reserved
D[15:0]
Reset value 0000000000000000
0x08
BKP_DR2
Reserved
D[15:0]
Reset value 0000000000000000
0x0C
BKP_DR3
Reserved
D[15:0]
Reset value 0000000000000000
0x10
BKP_DR4
Reserved
D[15:0]
Reset value 0000000000000000
0x14
BKP_DR5
Reserved
D[15:0]
Reset value 0000000000000000
0x18
BKP_DR6
Reserved
D[15:0]
Reset value 0000000000000000
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