r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 679

• Manufacturer Part Number: r5f21368sdfp
• Description: Renesas Mcu R8c Family / R8c/3xt-a Series
• Manufacturer: Renesas Electronics Corporation.

Under development
R8C/36T-A Group
R01UH0240EJ0001 Rev.0.01
Apr 28, 2011
Figure 26.15
26.5.7.7
This command is used to confirm that all addresses of a given block are blank data FFh.
When 25h is written in the first bus cycle and D0h is written in the second bus cycle to any address of the block,
blank check starts in the specified block. The FST7 bit in the FST register can be used to confirm whether blank
check has completed. The FST7 bit is set to 0 during the blank-check period and set to 1 when blank check
completes.
After blank check has completed, the blank-check result can be confirmed by the FST5 bit in the FST register
(refer to 26.5.8 Full Status Check). This command is used to verify the target block has not been written to. To
confirm whether erasure has completed normally, execute the full status check.
Do not execute the block blank check command when the FST6 bit is set to 1 (during erase-suspend).
Figure 26.15 shows a Block Blank Check Flowchart.
This command is intended for programmer manufacturers, not for general users.
Preliminary document
Specifications in this document are tentative and subject to change.
Block Blank Check Command
Block Blank Check Flowchart
Write the command code 25h
Write D0h to the start
address of the block
Full status check
Completed
FST7 = 1?
Start
Yes
No
FST7: Bit in FST register
26. Flash Memory
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