AT45DB021E datasheet(40/69 Pages) RENESAS

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DS-AT45DB021E-8789 Rev. N

Page 40

3/24/26

AT45DB021E Datasheet

16. Operation Mode Summary

The commands described previously can be grouped into four different categories to better describe which

commands can be executed at what times.

Group A commands consist of:

• Main Memory Page Read

• Continuous Array Read (SPI)

• Read Sector Protection Register

• Read Sector Lockdown Register

• Read Security Register

•Buffer Read

Group B commands consist of:

• Page Erase

• Block Erase

• Sector Erase

• Chip Erase

• Main Memory Page to the Buffer Transfer

• Main Memory Page to the Buffer Compare

• Buffer to Main Memory Page Program with Built-In Erase

• Buffer to Main Memory Page Program without Built-In Erase

• Main Memory Page Program through the Buffer with Built-In Erase

• Main Memory Byte/Page Program through Buffer without Built-In Erase

• Auto Page Rewrite

• Read-Modify-Write

Group C commands consist of:

•Buffer Write

• Status Register Read

• Manufacturer and Device ID Read

• Group D commands consist of:

• Erase Sector Protection Register

• Program Sector Protection Register

• Sector Lockdown

• Program Security Register

• Buffer and Page Size Configuration

• Freeze Sector Lockdown

If a Group A command is in progress (not fully completed), then another command in Group A, B, C, or D must not

be started. However, during the internally self-timed portion of Group B commands, any command in Group C can

be executed. The Group B commands using the Buffer must use Group C commands. Finally, during the internally

self-timed portion of a Group D command, only the Status Register Read command is executable.

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