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M16C/64C Group
30.8.6.7
Read Lock Bit Status
The read lock bit status command is used to read the lock bit state of a specified block.
By writing xx71h in the first bus cycle and xxD0h to the highest even address of a block in the second
bus cycle, the FMR16 bit in the FMR1 register stores information on the lock bit status of a specified
block. Read the FMR16 bit after the FMR00 bit in the FMR0 register becomes 1 (ready). Do not
execute other commands while the FMR00 bit is 0.
Figure 30.22 shows a flowchart of the Read Lock Bit Status Command.
Figure 30.22 Read Lock Bit Status Command
R01UH0092EJ0110 Rev.1.10
Jul 31, 2012
Start
Write command code xx71h
to X address
Write xxD0h to BA address
No
FMR00 = 1?
Yes
Read the FMR16 bit
Read lock bit status
completed
30. Flash Memory
Page 694 of 807
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