Contents
How many timers are there in STM32?
Note that it is a 16-bit timer and can only count up. If you look in section 3.11 of that same datasheet, you will find a “clock tree,” which is a diagram showing you how the clocks are connected to various prescalers and peripherals inside the STM32 chip.
How are multiple interrupts handled?
Multiple interrupt requests require a mechanism to handle each interrupt. Two or more interrupts requests may also be received simultaneously. Moreover, a new interrupt may be received by the processor while an earlier interrupt is being handled.
Which timer is used as a Boderate generator?
Timer 2 may be used as a baud rate generator. This is accomplished by setting either RCLK (T2CON. 5) or TCLK (T2CON. 4).
What is CCR1 STM32?
The compare 1 register (CCR1) value defines the pulse start time, while the auto-reload register (ARR) value defines the end of pulse. The effective pulse width is then defined as the difference between the ARR and CCR1 register values.
How to handle multiple interrupts with STM32F7?
My MCU based control system must check 18 switch contact status fastly. I will use STM32F7 MCU and it has maximum 16 int. handler. So I have been decided to use IO expendar IC and divided groups. Now I have 12 IO external interrupt and 2 more interrupt comes from IO expander.
What happens when the reset state of STM32 is reached?
At the reset state, all interrupts are disabled. The processor begins executing the code instructions with a base execution priority lower than the lowest programmable priority level, so any enabled interrupt can pre-empt the processor. When an enabled interrupt is asserted, the interrupt is serviced by the corresponding ISR handler.
How are external interrupts connected to NVIC using STM32?
External interrupts are connected to NVIC through a particular external interrupt controller (EXTI). It allows mapping multiple GPIO lines to NVIC external interrupt inputs. STM32F100RB interrupt controller consists of 18 edge detector lines.
What happens when an exception occurs in STM32?
When an exception occurs, the current instruction stream is stopped and the processor accesses the exceptions vector table. The vector address of that exception is loaded from the vector table. The exception handler starts to be executed in handler mode. The exception handler returns back to main (assuming no further nesting).