tamper and alternate function configuration register
| TAMP1E | RTC_TAMP1 input detection enable |
| TAMP1TRG | Active level for RTC_TAMP1 input |
| TAMPIE | Tamper interrupt enable |
| TAMP2E | RTC_TAMP2 input detection enable |
| TAMP2_TRG | Active level for RTC_TAMP2 input |
| TAMPTS | Activate timestamp on tamper detection event |
| TAMPFREQ | Tamper sampling frequency |
| TAMPFLT | RTC_TAMPx filter count |
| TAMP_PRCH | RTC_TAMPx precharge duration |
| TAMP_PUDIS | RTC_TAMPx pull-up disable |
| PC13VALUE | RTC_ALARM output type/PC13 value |
| PC13MODE | PC13 mode |
| PC14VALUE | PC14 value |
| PC14MODE | PC14 mode |
| PC15VALUE | PC15 value |
| PC15MODE | PC15 mode |