18 Questions
What is the purpose of the HPRE field in a microcontroller?
To control the clock division factor for the AHB bus
When must the AHB clock frequency be at least 25 MHz?
When using the Ethernet
What happens to the clocks after writing to the HPRE register?
The clocks are divided with the new prescaler factor from 1 to 16 AHB cycles later
What needs to be done to access registers in a module after reset?
Enable the bus clock for that module
What is the purpose of the D17 bit in the RCC_APB1ENR register?
To enable the clock for USART2
What value does the USART_BRR register typically hold?
$16$-bit value for baud rate generation
Which part of the BRR register is utilized for setting the baud rate?
$8$-bit part
What happens to the TXE flag when a character is moved to the transmit shift register?
Automatically sets to 1
What is the significance of the TXE flag in USART communication?
Indicates DR register can accept another character
Which USART register is responsible for transmitting characters from the microcontroller?
DR register
What action marks the DR register as ready to accept a new character?
Setting TXE flag to 1
What is the role of the TXE flag in avoiding data loss?
It prevents new data from being written until previous data is sent
Which part of the USART control sequence involves shifting out characters?
'Y', 'e', 's'
In USART communication, what triggers a new character transmission after the last character?
's' character moving to shift register
After a character is shifted out, what allows loading a new character into the DR register?
's' character moved to shift register
What prevents a new character from being written into the DR register when transmitting data?
's' shifting out
What event marks the DR register as empty and ready for new data?
The falling edge of TXE flag.
Why is it important for the TXE flag to be set when transmitting data via USART2?
It shows that the Data Register (DR) can accept another character.
Test your knowledge on STM32 clock configuration settings such as prescaler factors and clock division for AHB and APB buses. Understand the impact of setting the correct values to avoid exceeding specific clock frequency limits.
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