An MCU programmer wants to develop a real time chronometer, which can count to minutes,

on STMF by using a timer peripheral TIM TIM has a bit TIMxPSC register, a bit

TIMxARR register, and a bit TIMxCNT register. TIM is connected to the APB bus. The source

clock of the timer is clock of the bus. Assume that all required settings and variable declarations are

done and the code will be executed after resetting.

i APB bus has arranged to have a clock frequency of MHz Analyze the below code and

determine the values, those should be written to related registers. Show your calculations and

justify your results. Determine the period of the timer and the time it takes to create an interrupt request.

TIMHandleTypeDef htim;

int mainvoid

TIMPSC;

TIMARR;

HALTIMBaseStartIT&htim;

Interrupt handler void TIMIRQHandlervoid

HALTIMIRQHandler&htim; clears IRQ

splitsecond splitsecond ; salise

if splitsecond

splitsecond ;

second second;

if second

second ;

minute minute ;

if minute

minute ;

Interrupt handler void EXTIIRQHandlervoid

HALGPIOEXTIIRQHandlerGPIOPIN; clears IRQ

iTIMxCNT;