Serial: TX1,RX1,TX2,RX2,TX3,RX3 these are UART pins.Analog pins: PA0-PA7, PB0-PB1 these pins act as ADCs.Power: 3.3V, 5V, GND these three pins can be used to power board.Most of the pins can perform more than one functions like PWM, SPI-serial communication, I 2 C ports ( two-wire communication via the IIC protocol). Each pin has a current source/sink ability of 6mA. Pull-up and pull-down resistors can be enabled on each of the pins. Ports A and B has 16pins, port C has 3pins, and Port D has 3Pins.
The Blue Pill has 4 ports with total of 37 GPIO pins, different ports have different number of pins.
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