ATtiny5 datasheet(113/168 Pages) ATMEL

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113

8127C–AVR–10/09

ATtiny4/5/9/10

Before starting the Chip erase, the NVMCMD register must be loaded with the CHIP_ERASE

command. To start the erase operation a dummy byte must be written into the high byte of a

word location that resides inside the Flash code section. The NVMBSY bit remains set until eras-

ing has been completed. While the Flash is being erased neither Flash buffer loading nor Flash

reading can be performed.

The Chip Erase can be carried out as follows:

1. Write the CHIP_ERASE command to the NVMCMD register

2. Start the erase operation by writing a dummy byte to the high byte of any word location

inside the code section

3. Wait until the NVMBSY bit has been cleared

15.4.3.2

Erasing the Code Section

The algorithm for erasing all pages of the Flash code section is as follows:

1. Write the SECTION_ERASE command to the NVMCMD register

2. Start the erase operation by writing a dummy byte to the high byte of any word location

inside the code section

3. Wait until the NVMBSY bit has been cleared

15.4.3.3

Writing a Code Word

The algorithm for writing a word to the code section is as follows:

1. Write the WORD_WRITE command to the NVMCMD register

2. Write the low byte of the data into the low byte of a word location

3. Write the high byte of the data into the high byte of the same word location. This will

start the Flash write operation

4. Wait until the NVMBSY bit has been cleared

15.4.3.4

Erasing the Configuration Section

The algorithm for erasing the Configuration section is as follows:

1. Write the SECTION_ERASE command to the NVMCMD register

2. Start the erase operation by writing a dummy byte to the high byte of any word location

inside the configuration section

3. Wait until the NVMBSY bit has been cleared

15.4.3.5

Writing a Configuration Word

The algorithm for writing a Configuration word is as follows.

1. Write the WORD_WRITE command to the NVMCMD register

2. Write the low byte of the data to the low byte of a configuration word location

3. Write the high byte of the data to the high byte of the same configuration word location.

This will start the Flash write operation.

4. Wait until the NVMBSY bit has been cleared

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