Embedded Questions -STM32

1. LSE(Low Speed External) clock in STM32 Nucleo board :

Enabled by default

Needs to be enabled by RCC->BDCR register

None of the above

2. STM32 device can fetch instruction from :

Only Flash

Only SRAM

Flash or SRAM

Only from Bootloader

3. APB in STM32 stands for :

Application Process Bus

Advanced Peripheral Bus

None of the above

4. Which of the following statements are True to program RTC?

Enable PWR block

Disable RTC protection

Boot from default factory program in system memory

5. The header file provided by Truestudio IDE for STM32 has many #define macros. Which of the following solution can help to understand the actual values of various definitions ?

You can decode #define values based on various device features from datasheet

You may verify from Linker map file

You may check temporary file after Pre-processor phase of compilation

Download code and check memory

6. Which of the following is True for STM32 ?

If you halt CPU execution, RTC will also stop

RTC is separate IP block and will continue to run even after CPU is halted

We can’t halt CPU when RTC is running

7. What happens if Boot configuration in STM32 is set to boot from Flash User/Application area but Flash is empty ?

CPU will throw exception

CPU will execute default bootloader from sytem memory

CPU will stuck at first instruction address

None of the above

8. Which of the following is True for STM32 bootloader using USB interface ?

If there is a separate USB port for boot loader , ST-Link can also take control of device using ST-Link USB interface

ST-Link interface will not work if Boot loader is programmed.

9. Boot configuration in STM32 is done by :

Hardware only

Hardware and/or option bytes programming

Factory programmed

None of the above

10. What is the purpose of external crystal for LSE(Low Speed External) in STM32 Nucleo board ?

It is required to sync-up LSE(Low Speed Internal)

RTC can’t work without LSE .

It is required for STM32 Peripherals

Crystal is much better in terms of accuracy over temperature range and less jitter

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Embedded Questions -STM32

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