CompSystems 245 - Week 4 - Lecture 12 - Timers and Counters

Describe the timer and counter:

• What they are

• How they are implemented

Describe the timer/counters:

• The types of registers

• The kind of timer/counter

• Uses as inputs

Describe timer/counters:

• the template name for the timer/counter registers

  • their sizes

• what happens when it counts up or down

  • describe the modes

• what is meant by a prescaler

Describe timers:

• their channels

  • uses

• interrupts

  • causes of interrupts

Describe how a counter can be used in conjunction with a temperature sensor to count the number of pulses:

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Describe the timers that can be used in STM32F4 microcontroller

Describe the timer:

• the equation for the frequency of the timer if the input signal is periodic with a fixed frequency

• equation for the time interval for which interrupts are generated

Draw the counter timing diagram for a timer in up counting mode:

• An update event when ARPE=0 (TIMx_ARR not pre-loaded)

• when the precaler division has changed from 1 to 4

Draw the counter timing diagram for a timer in down counting mode:

• an update event occurs

Describecounters/timers in center-aligned mode:

• what happens during center aligned mode

• draw the counter timing diagram where the internal clock is divided by 1

Answer:

Describe output compare:

• what it is

• what it does

• a schematic of it

Describe output compare:

• how to use it in STM32CubeIDE

Describe what is meant by input capture of a timer/counter:

• what it is

• how its used

• schematic of it in the timer/counter

• extra features

Describe how input capture of a timer/counter is used in STM32CubeIDE:

• its function

• how to set it up

• how to read a value from the counter when an event occurs and store it in a global variable

Describe the config of timers of the STM32F407 on STM32CubeIDE:

• what the timers are

• slave Mode

• trigger source

• clock source

• channels

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