RM0401 Rev 3 139/771
RM0401 General-purpose I/Os (GPIO)
154
• GPIO
Configure the desired I/O as output or input in the GPIOx_MODER register.
• Peripheral alternate function
For the ADC configure the desired I/O as analog in the GPIOx_MODER register.
For other peripherals:
– Configure the desired I/O as an alternate function in the GPIOx_MODER register
– Select the type, pull-up/pull-down and output speed via the GPIOx_OTYPER,
GPIOx_PUPDR and GPIOx_OSPEEDER registers, respectively
– Connect the I/O to the desired AFx in the GPIOx_AFRL or GPIOx_AFRH register
• EVENTOUT
Configure the I/O pin used to output the Cortex
®
-M4 with FPU EVENTOUT signal by
connecting it to AF15
Please refer to the “Alternate function mapping” table in the datasheets for the detailed
mapping of the system and peripherals’ alternate function I/O pins.
Table 25. Flexible SWJ-DP pin assignment
Available debug ports
SWJ I/O pin assigned
PA13 /
JTMS/
SWDIO
PA14 /
JTCK/
SWCLK
PA15 /
JTDI
PB3 /
JTDO
PB4/
NJTRST
Full SWJ (JTAG-DP + SW-DP) - Reset state X X X X X
Full SWJ (JTAG-DP + SW-DP) but without
NJTRST
XXXX
JTAG-DP Disabled and SW-DP Enabled X X
JTAG-DP Disabled and SW-DP Disabled Released
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