RM0444 Rev 5 921/1390
RM0444 Tamper and backup registers (TAMP)
926
Note: This register concerns only the tamper inputs in passive mode.
31.6.4 TAMP interrupt enable register (TAMP_IER)
Address offset: 0x2C
Backup domain reset value: 0x0000 0000
System reset: not affected
Bits 31:8 Reserved, must be kept at reset value.
Bit 7 TAMPPUDIS: TAMP_INx pull-up disable
This bit determines if each of the TAMPx pins are precharged before each sample.
0: Precharge TAMP_INx pins before sampling (enable internal pull-up)
1: Disable precharge of TAMP_INx pins.
Bits 6:5 TAMPPRCH[1:0]: TAMP_INx precharge duration
These bit determines the duration of time during which the pull-up/is activated before each
sample. TAMPPRCH is valid for each of the TAMP_INx inputs.
0x0: 1 RTCCLK cycle
0x1: 2 RTCCLK cycles
0x2: 4 RTCCLK cycles
0x3: 8 RTCCLK cycles
Bits 4:3 TAMPFLT[1:0]: TAMP_INx filter count
These bits determines the number of consecutive samples at the specified level
(TAMP*TRG) needed to activate a tamper event. TAMPFLT is valid for each of the
TAMP_INx inputs.
0x0: Tamper event is activated on edge of TAMP_INx input transitions to the active level (no
internal pull-up on TAMP_INx input).
0x1: Tamper event is activated after 2 consecutive samples at the active level.
0x2: Tamper event is activated after 4 consecutive samples at the active level.
0x3: Tamper event is activated after 8 consecutive samples at the active level.
Bits 2:0 TAMPFREQ[2:0]: Tamper sampling frequency
Determines the frequency at which each of the TAMP_INx inputs are sampled.
0x0: RTCCLK / 32768 (1 Hz when RTCCLK = 32768 Hz)
0x1: RTCCLK / 16384 (2 Hz when RTCCLK = 32768 Hz)
0x2: RTCCLK / 8192 (4 Hz when RTCCLK = 32768 Hz)
0x3: RTCCLK / 4096 (8 Hz when RTCCLK = 32768 Hz)
0x4: RTCCLK / 2048 (16 Hz when RTCCLK = 32768 Hz)
0x5: RTCCLK / 1024 (32 Hz when RTCCLK = 32768 Hz)
0x6: RTCCLK / 512 (64 Hz when RTCCLK = 32768 Hz)
0x7: RTCCLK / 256 (128 Hz when RTCCLK = 32768 Hz)
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
ITAMP6
IE
ITAMP5
IE
ITAMP4
IE
ITAMP3
IE
Res. Res.
rw
rw
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1514131211109876543210
Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res. Res.
TAMP
3IE
TAMP
2IE
TAMP
1IE
rw
rw rw
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