m30833fjgp Renesas Electronics Corporation., m30833fjgp Datasheet - Page 427

• Manufacturer Part Number: m30833fjgp
• Description: Renesas 16/32-bit Single-chip Microcomputer M16c Family / M32c/80 Series
• Manufacturer: Renesas Electronics Corporation.

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Figure 25.9 Lock Bit Program Command
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25.3.5.7 Lock Bit Program Command
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The lock bit program command sets the lock bit for a specified block to "0" (locked).
By writing command code "xx77
dress of a block in the second bus cycle, auto write operation starts, and the lock bit for the specified
block is set to "0". Do not access the flash memory or execute the next instructions during the lock bit
program operation.
The FMR00 bit in the FMR0 register indicates whether or not the lock bit program operation has been
completed. After the completion of a lock bit program operation, the Status register indicates whether
or not the operation has been completed as expected. (Refer to 25.3.6 Full Status Check.)
Figure 25.9 shows a flow chart of the lock bit program command programming.
Refer to 25.3.6 Data Protect Function for details on how to set the lock bit function to "0" (unlocked).
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Write "xxD0
) T
8
Write command code
order block address
16
(auto write operation
Full status check
Lock bit program
FMR00 bit = 1?
" in the first bus cycle and "xxD0
completed?)
operation is
completed
"xx77
16
Start
" to the highest-
YES
16
"
NO
16
" to the highest-order even ad-
See Figure 25.11
25. Flash Memory Version