Keil uvision microcontroller programming STM 32F746

1) Configure port H, half as inputs with PULLUP and high switching speed and the other half as PUSHPULL outputs and medium switching speed.

2) Set the Systick function to generate interrupts every 20 milliseconds.

3) Configure the external interrupts so that rising edge changes can be identified by pins 10, 11, and 12 of port D.

4) Tell what the PR record is for and how it is used.

5) Explain how the NVIC block handles external interrupts.