Цитата
PC13, PC14 and PC15 are supplied through the power switch, and sotheir use in output mode is limited: they can be used only in output 2 MHz mode with a maximum load of 30 pFand only one pin can be put in output mode at a time.
Из чего вроде как ясно следует, что эти ноги НЕЛЬЗЯ использовать одновременно, как цифровой выход. Но в то же время в reference manual, на те же ноги я нашел следующее:
Цитата
When the backup domain is supplied by VDD(analog switch connected to VDD), the following functions are available:
• PC14 and PC15 can be used as either GPIO or LSE pins
• PC13 can be used as GPIO, TAMPER pin, RTC Calibration Clock, RTC Alarm or second output (refer to Section 6: Backup registers (BKP) on page 81)
Note: Due to the fact that the switch only sinks a limited amount of current (3 mA), the use of GPIOs PC13 to PC15 in output mode is restricted: the speed has to be limited to 2 MHz with a maximum load of 30 pF and these IOs must not be used as a current source (e.g. to drive an LED).
• PC14 and PC15 can be used as either GPIO or LSE pins
• PC13 can be used as GPIO, TAMPER pin, RTC Calibration Clock, RTC Alarm or second output (refer to Section 6: Backup registers (BKP) on page 81)
Note: Due to the fact that the switch only sinks a limited amount of current (3 mA), the use of GPIOs PC13 to PC15 in output mode is restricted: the speed has to be limited to 2 MHz with a maximum load of 30 pF and these IOs must not be used as a current source (e.g. to drive an LED).
А из этого вроде как можно использовать все три как выход, но только сильно не нагружать.
Кто нибудь может мне разъяснить: можно или нет одновременно все три эти пина использовать как GPIO output?
