英文资料中是这样写的:
PC13, PC14 and PC15 are supplied through the power switch. Since the switch only sinks a limited amount of current
(3 mA), the use of GPIOs PC13 to PC15 in output mode is limited: the speed should not exceed 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).
英文也有写only one I/O at a time can be used as an output
PC13, PC14 and PC15 are supplied through the power switch and since the switch only sinks a limited amount of current
(3 mA), the use of GPIOs PC13 to PC15 is restricted: only one I/O at a time can be used as an output, the speed has to be
limited to 2 MHz with a maximum load of 30 pF and these I/Os must not be used as a current source (e.g. to drive an LED).
谢谢版主及MCUISP的回复、指点!!
但我刚上了ST网站下载了最新版的PDF文档(http://www.st.com/mcu/devicedocs-STM32F103C8-110.html 13587.pdf),找不到“only one I/O at a time can be used as an output”这样的描述,不知MCUISP 您的文档是哪个版本,若PC口三个脚只能“同一时间,三个引脚中只有一个引脚能作为输出引脚”,那么我如果把三个脚都用作输出,该如何使用?