Questions and Answers
What instruction is used to wait for the completion of the last write operation in the EEPROM?
Which register holds the high byte address during the EEPROM write process?
What value is being loaded into register R16 before writing to the EEPROM Data Register?
What is the purpose of the instruction 'SBI EECR, EEMPE'?
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What happens after the instruction 'SBI EECR, EEPE' is executed?
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Which instruction confirms the completion of a previous EEPROM write operation?
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What is the purpose of the WAIT loop in the code?
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What is the instruction that will make the program jump back to the WAIT label?
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In which register are the low byte address bits loaded during the EEPROM write process?
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What is the sequence of instructions needed to actually write data to the EEPROM after enabling it?
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Study Notes
Microcontrollers and Boot Loaders
- Boot loaders are essential for initiating tasks on microcontrollers.
- SRAM is known for its volatile data storage, losing data when power is off.
- Non-volatile EEPROM retains data even without power, useful for essential data storage.
EEPROM Data Register (EEDR)
- EEDR is a critical component for data manipulation in EEPROM.
- Bit 2 – EEMPE (EEPROM Master Write Enable):
- Activating EEMPE (setting to 1) allows writing to EEPROM within four clock cycles.
Writing Data to EEPROM
- Writing data requires ensuring the previous operation is complete by using the EEPE bit.
- Assembly code demonstrates step-by-step writing to the EEPROM:
- Wait for the last write operation to finish using the SBIC instruction to check EEPE.
- Load the address where data will be written into two registers (R18 for high byte, R17 for low byte).
- Write the high and low address bytes to EEARH and EEARL.
- Load data (e.g., character 'A') into R16.
- Transfer this data into the EEPROM Data Register (EEDR).
- Enable writing by setting EEMPE and EEPE in the EECR register.
Example of Reading EEPROM
- An example is provided for reading the content at the EEPROM address 0x02B1, highlighting the need for proper register usage and instructions.
Assembly Language Context
- Familiarity with assembly language is crucial for manipulating EEPROM.
- Understanding of registers and operations is important for successful microcontroller programming.
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Description
This quiz focuses on the essential concepts of boot loaders for microcontrollers. Understanding how to properly burn a boot loader onto chips is crucial for enhancing their functionality and performance. Test your knowledge on this fundamental topic in embedded systems.
