DocID025202 Rev 7
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RM0365
Real-time clock (RTC)
764
Table 130. RTC pin PC13 configuration
(1)
Pin
configuration
and function
RTC_ALARM
output
enabled
RTC_CALIB
output
enabled
RTC_TAMP1
input
enabled
RTC_TS
input
enabled
PC13MODE
bit
PC13VALUE
bit
RTC_ALARM
output OD
1
Don’t care
Don’t care
Don’t care
Don’t care
0
RTC_ALARM
output PP
1
Don’t care
Don’t care
Don’t care
Don’t care
1
RTC_CALIB
output PP
0
1
Don’t care
Don’t care
Don’t care
Don’t care
RTC_TAMP1
input floating
0
0
1
0
Don’t care
Don’t care
RTC_TS and
RTC_TAMP1
input floating
0
0
1
1
Don’t care
Don’t care
RTC_TS input
floating
0
0
0
1
Don’t care
Don’t care
Output PP
forced
0
0
0
0
1
PC13 output
data value
Wakeup pin or
Standard
GPIO
0
0
0
0
0
Don’t care
1. OD: open drain; PP: push-pull.
Table 131. LSE pin PC14 configuration
(1)
Pin configuration and
function
LSEON bit in
RCC_BDCR register
LSEBYP bit in
RCC_BDCR register
PC14MODE
bit
PC14VALUE
bit
LSE oscillator
1
0
Don’t care
Don’t care
LSE bypass
1
1
Don’t care
Don’t care
Output PP forced
0
Don’t care
1
PC14 output data
value
Standard GPIO
0
Don’t care
0
Don’t care
1. OD: open drain; PP: push-pull.
Table 132. LSE pin PC15 configuration
(1)
Pin configuration and
function
LSEON bit in
RCC_BDCR register
LSEBYP bit in
RCC_BDCR register
PC15MODE
bit
PC15VALUE
bit
LSE oscillator
1
0
Don’t care
Don’t care
Output PP forced
1
1
1
PC15 output data
value
0
Don’t care
Standard GPIO
0
Don’t care
0
Don’t care
1. OD: open drain; PP: push-pull.