r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 690

• Manufacturer Part Number: r5f21346mnfp
• Description: Single-chip Mcus Incorporates The R8c Cpu Core
• Manufacturer: Renesas Electronics Corporation.

R8C/34M Group
R01UH0131EJ0100 Rev.1.00
Jun 21, 2011
Figure 32.16
32.4.11.7 Block Blank Check Command
This command is used to confirm that all addresses in any 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 block address, blank
checking starts in the specified block. The FST7 bit in the FST register can be used to confirm whether blank
checking has completed. The FST7 bit is set to 0 during the blank-check period and set to 1 when blank
checking completes.
After blank checking has completed, the blank-check result can be confirmed by the FST5 bit in the FST
register. (Refer to 32.4.12 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 32.16 shows a Block Blank Check Flowchart.
This command is intended for programmer manufactures, not for general users.
Block Blank Check Flowchart
Write the command code 25h
Write D0h to any block
address
Full status check
FST7 = 1?
Completed
Start
Yes
No
FST7: Bit in FST register
32. Flash Memory
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