 Hello, and welcome to this presentation of the STM Extended Interrupts and Events Controller. We will be presenting the features of the EXTI. The EXTI controller provides up to 41 independent lines, split into two categories, configurable lines, and direct lines. The applications could benefit through smarter use of low power modes, taking advantage of the capability to wake up the external communication or requests. The EXTI controller provides interrupt and event generation, as well as the capability to wake up the processor from stop modes. Configurable lines allow the user to select which active edge generates interrupts or events with a dedicated status flag for each line. Requests on configurable lines can also be generated by software. Configurable lines are linked with external interrupts from GPIO, comparators, PVD, RTC, and PVM. These lines can wake up the processor from both stop zero, stop one, and stop two modes. Direct lines provide less configuration options, with status flags provided by related peripherals. They are linked mainly with LCD and communication peripherals. Direct lines can only wake up the processor from stop zero, stop one mode, except those coming from I2C3, LPTIM1, and LPUART1. As mentioned on the previous slide, configurable lines can act as a wake-up source from both stop zero, stop one, and stop two modes. They provide the capability to wake up from a GPIO rising or falling edge, programmable voltage detector, RTC, comparators, and peripheral voltage monitor. Direct lines can only act as a wake-up source from stop zero, stop one mode, except I2C3, LPUART1, and LPUTIM1, which can serve as a wake-up source from stop two mode as well.