r5f21346mnfp Renesas Electronics Corporation., r5f21346mnfp Datasheet - Page 689

• 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 32.15
32.4.11.6 Read Lock Bit Status Command
This command is used to read the lock bit status of any block in the program ROM area.
When 71h written in the first bus cycle and D0h is written in the second cycle to the starting block address, the
lock bit status of the specified block is stored in the LBDATA bit in the FST register. After the FST7 bit in the
FST register has been set to 1 (ready), read the LBDATA bit.
Figure 32.15 shows a Read Lock Bit Status Flowchart.
Read Lock Bit Status Flowchart
Write the command code 71h
Write D0h to the starting
block address
Full status check
Completed
FST7 = 1?
Start
Yes
No
FST7: Bit in FST register
32. Flash Memory
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