M32CSLASH86 datasheet(433/505 Pages) RENESAS

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Page 410

25. Flash Memory Version

)

(

25.3.5.7 Lock Bit Program Command

The lock bit program command sets the lock bit for a specified block to "0" (locked).

By writing command code "xx7716" in the first bus cycle and "xxD016" to the highest-order even ad-

dress of a block in the second bus cycle, the lock bit for the specified block is set to "0". The address

value specified in the first bus cycle must be the same highest-order even address of a block specified

in the second bus cycle.

Figure 25.11 shows a flow chart of the lock bit program command programming. Execute read lock bit

status command to read lock bit state (lock bit data).

The FMR00 bit in the FMR0 register indicates whether a lock bit program operation is completed.

Refer to 25.3.6 Data Protect Function for details on lock bit functions and how to set it to "1" (un-

locked).

Start

Lock bit program operation

is completed

YES

Write the command code "xx7716" to

the highest-order block address

FMR00=1?

Full status check

Write "xxD016" to the highest-order

block address

NOTES:

1. Write the command code and data to even addresses.

Figure 25.11 Lock Bit Program Command

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