Timer prescaler and clock division in Embedded C - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the timer prescaler to divide the clock by 8.

Embedded C

TIM->PSC = [1] - 1;

Drag options to blanks, or click blank then click option'

A8

B4

C2

D16

Attempts:

3 left

💡 Hint

Common Mistakes

Setting PSC directly to 8 instead of 7.

Confusing prescaler value with division factor.

The prescaler register (PSC) divides the input clock by the value plus one. To divide by 8, set PSC to 7 (8 - 1).

2fill in blank

medium

Complete the code to configure the timer clock division to divide by 4.

Embedded C

TIM->CR1 |= [1];

Drag options to blanks, or click blank then click option'

ATIM_CR1_CKD_1

BTIM_CR1_CKD_0

CTIM_CR1_CKD_0 | TIM_CR1_CKD_1

DTIM_CR1_CKD_2

Attempts:

3 left

💡 Hint

Common Mistakes

Using only TIM_CR1_CKD_0 which sets division by 2.

Combining bits incorrectly.

To set clock division to divide by 4, set CKD bits to '10', which corresponds to TIM_CR1_CKD_1.

3fill in blank

hard

Fix the error in the code to correctly set the prescaler for a 1 MHz timer clock from an 8 MHz source.

Embedded C

TIM->PSC = [1];

Drag options to blanks, or click blank then click option'

A1

B8

C7

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Setting PSC to 8 instead of 7.

Setting PSC to 0 which means no division.

To get 1 MHz from 8 MHz, divide by 8. Since PSC = division factor - 1, PSC should be 7.

4fill in blank

hard

Fill both blanks to create a timer configuration that sets prescaler to divide by 16 and clock division to divide by 2.

Embedded C

TIM->PSC = [1] - 1;
TIM->CR1 |= [2];

Drag options to blanks, or click blank then click option'

A16

BTIM_CR1_CKD_0

CTIM_CR1_CKD_1

D8

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong prescaler value.

Setting wrong clock division bits.

Prescaler for divide by 16 is 15 (16 - 1). Clock division by 2 is set by TIM_CR1_CKD_0.

5fill in blank

hard

Fill all three blanks to configure a timer with prescaler dividing by 10, clock division dividing by 4, and enable the timer counter.

Embedded C

TIM->PSC = [1] - 1;
TIM->CR1 |= [2];
TIM->CR1 |= [3];

Drag options to blanks, or click blank then click option'

A10

BTIM_CR1_CKD_1

CTIM_CR1_CEN

DTIM_CR1_CKD_0

Attempts:

3 left

💡 Hint

Common Mistakes

Not subtracting 1 for prescaler.

Using wrong clock division bits.

Forgetting to enable the counter.

Prescaler for divide by 10 is 9 (10 - 1). Clock division by 4 is TIM_CR1_CKD_1. Enable counter by setting TIM_CR1_CEN.