Selection Of Rtc Additional Functions - ST STM32F413 Reference Manual

Advanced arm-based 32-bit mcus

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General-purpose I/Os (GPIO)

Selection of RTC additional functions

The STM32F4xx feature one GPIO pin RTC_AF1 that can be used for the detection of a

tamper or time stamp event, or RTC_ALARM, or RTC_CALIB RTC outputs.

The RTC_AF1 (PC13) can be used for the following purposes:

RTC_ALARM output: this output can be RTC Alarm A, RTC Alarm B or RTC Wakeup

depending on the OSEL[1:0] bits in the RTC_CR register

RTC_CALIB output: this feature is enabled by setting the COE[23] in the RTC_CR

RTC_TAMP1: tamper event detection

RTC_TS: time stamp event detection

The selection of the corresponding pin is performed through the RTC_TAFCR register as

TAMP1INSEL is used to select which pin is used as the RTC_TAMP1 tamper input

TSINSEL is used to select which pin is used as the RTC_TS time stamp input

ALARMOUTTYPE is used to select whether the RTC_ALARM is output in push-pull or

open-drain mode

The output mechanism follows the priority order listed in

configuration

and function

out output PP

input floating

input floating

input floating

1. OD: open drain; PP: push-pull.

Table 27. RTC additional functions

DocID029473 Rev 3

pin selection

configuration