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Rev.1.02 Jul 01, 2005 page 248 of 314
REJ09B0126-0102
M16C/6N Group (M16C/6NL, M16C/6NN) 20. Flash Memory Version
Under development
This document is under development and its contents are subject to change.
Figure 20.8 Program Command
20.3.5.4 Program Command (40h)
The program command writes 2-byte data to the flash memory.
By writing “xx40h” in the first bus cycle and data to the write address in the second bus cycle, an auto
program operation (data program and verify) will start. The address value specified in the first bus cycle
must be the same even address as the write address specified in the second bus cycle.
The FMR00 bit in the FMR0 register indicates whether an auto program operation has been completed.
The FMR00 bit is set to “0” (busy) during auto program and to “1” (ready) when an auto program operation
is completed.
After the completion of an auto program operation, the FMR06 bit in the FMR0 register indicates
whether or not the auto program operation has been completed as expected. (Refer to 20.3.8 Full
Status Check.)
An address that is already written cannot be altered or rewritten.
Figure 20.8 shows a flow chart of the program command programming.
The lock bit protects each block from being programmed inadvertently. (Refer to 20.3.6 Data Protect
Function.)
In EW1 mode, do not execute this command on the block where the rewrite control program is allocated.
In EW0 mode, the microcomputer enters read status register mode as soon as an auto program operation
starts. The status register can be read. The SR7 bit in the status register is set to “0” at the same time an
auto program operation starts. It is set to “1” when auto program operation is completed. The microcom-
puter remains in read status register mode until the read array command is written. After completion of
an auto program operation, the status register indicates whether or not the auto program operation has
been completed as expected.
Start
YES
NO
Write the command code "xx40h"
to an address to be the written
FMR00=1?
Program operation is
completed
NOTE:
1.Write the command code and data to even addresses.
Full status check
Write data to an address
to be written
e
e
o
e
e
s
t
s
o