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R8C/18 Group, R8C/19 Group
17.4.3.4
Program Command
The program command writes data to the flash memory in 1-byte units.
By writing 40h 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. Make sure the address value specified in
the first bus cycle is the same address as the write address specified in the second bus cycle.
The FMR00 bit in the FMR0 register can be used to determine whether auto-programming has
completed. The FMR00 bit is set to 0 during auto-programming and set to 1 when auto-programming
completes.
The FMR06 bit in the FMR0 register can be used to determine the result of auto-programming after it
has been finished. (Refer to 17.4.5 Full Status Check.)
Do not write additions to the already programmed addresses.
When the FMR02 bit in the FMR0 register is set to 0 (rewriting disabled), or the FMR02 bit is set to 1
(rewrite enabled) and the FMR15 bit in the FMR1 register is set to 1 (rewriting disabled), program
commands targeting block 0 are not acknowledged. When the FMR16 bit is set to 1 (rewriting
disabled), program commands targeting block 1 are not acknowledged.
In EW1 mode, do not execute this command for any address which a rewrite control program is
allocated.
In EW0 mode, the MCU enters read status register mode at the same time auto-programming starts
and the status register can be read. The status register bit 7 (SR7) is set to 0 at the same time
auto-programming starts and set back to 1 when auto-programming completes. In this case, the MCU
remains in read status register mode until the next read array command is written. The status register
can be read to determine the result of auto-programming after/auto-programming has completed.
Figure 17.12
Program Command
Rev.1.30
Apr 14, 2006
REJ09B0222-0130
Write the command code 40h to
the write address
Write data to the write address
FMR00 = 1?
Full status check
Program completed
Page 189 of 233
Start
No
Yes
17. Flash Memory Version
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