M32C Datasheet, PDF (426/441 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Rev.B2 for proof reading _{Udnedveerlopment}
Appendix Standard Serial I/O Mode 2 (Flash Memory Version)
Mitsubishi Microcomputers
M32C/83 group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Lock Bit Program Command
This command writes “0” (lock) for the lock bit of the specified block. Execute the lock bit program
command as explained here following.
(1) Transfer the “7716” command code with the 1st byte.
(2) Transfer addresses A8 to A15 and A16 to A23 with the 2nd and 3rd bytes respectively.
(3) Transfer the verify command code “D016” with the 4th byte. With the verify command code, “0” is
written for the lock bit of the specified block. Write the highest address of the specified block for
addresses A8 to A23.
Lock bit status can be read with the read lock bit status command. For information on the lock bit
function, reset procedure and so on, see the section on the data protection function.
RxD1
(M32C reception data)
TxD1
(M32C transmit data)
7716
A8 to A16 to
A15
A23
D016
Figure 1.35.31. Timing for the lock bit program
Lock Bit Enable Command
This command enables the lock bit in blocks whose bit was disabled with the lock bit disable com-
mand. The command code “7A16” is sent with the 1st byte of the serial transmission. This command
only enables the lock bit function; it does not set the lock bit itself.
RxD1
(M32C reception data)
TxD1
(M32C transmit data)
Figure 1.35.32. Timing for enabling the lock bit
7A16
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