TIMER-Registers

• Timer Count Register (TIMx_CNT)

  Shows the current counter value. Size could be 32-bit or 16-bit depending on timer module used.

• Timer Auto-Reload Register (TIMx_ARR)

  Timer raises a flag and the counter restarts automatically when counter value reaches the value in the auto-reload register. The counter is an up counter by default but can also be configured to be a down counter.

  

• Timer Prescaler Register (TIMx_PSC)

  The prescaler slows down the counting speed of the timer by dividing the input clock of the timer

  

• Status Register (SR)

  

• Capture/Compare Register (ccr1, ccr2, ccr3, ccr4)

  

• Capture/Compare Mode Register

  

• Capture/Compare Enable Register (CCER)

  

TIMER- Some Terms

• Update Event

  When timeout occurs or how long it takes for flag to be raised

  

  The +1 is because we start from 0

• Period

  Value loaded into auto-reload register (TIM_ARR)

• Up counter

  Counts from zero to a set value.

• Down counter

  Counts from a set value down to zero

General Purpose Timer example