r5f21368sdfp Renesas Electronics Corporation., r5f21368sdfp Datasheet - Page 677

• 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 26.13
26.5.7.5
This command is used to set the lock bit of any block in the program ROM area to 0 (locked).
When 77h is written in the first bus cycle and D0h is written in the second bus cycle to the start address of the
block, 0 is written to the lock bit of the specified block. Make sure the address value in the first bus cycle is the
same address as the start address of the block specified in the second bus cycle.
Figure 26.13 shows a Lock Bit Program Flowchart. The lock bit status (lock bit data) can be read using the read
lock bit status command.
The FST7 bit in the FST register can be used to confirm whether writing to the lock bit has completed.
Refer to 26.5.6 Data Protect Function for the lock bit function and how to set the lock bit to 1 (not locked).
Preliminary document
Specifications in this document are tentative and subject to change.
Lock Bit Program Command
Lock Bit Program Flowchart
Write the command code
Write D0h to the start
address of the block
Full status check
Completed
FST7 = 1?
Start
77h
Yes
No
FST7: Bit in FST register
26. Flash Memory
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