M16C65 Datasheet, PDF (752/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
30. Flash Memory
30.8.4.7 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-order 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 is set to 1 (ready).
Figure 30.6 shows a Flow Chart of the Read Lock Bit Status Command Programming.
Start
Write the command code xx71h
Write xxD0h to the highest-
order block address
FMR00 = 1? ^NO
YES
FMR16 = 0? ^NO
YES
Block is locked
Block is not locked
Note:
1. Write the command code and data to even addresses.
Figure 30.6 Read Lock Bit Status Command
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
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