R8C/1A Group, R8C/1B Group
18. Flash Memory
Rev.1.30
Dec 08, 2006
Page 262 of 315
REJ09B0252-0130
18.4.3.4
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.
When suspend function disabled, the FMR00 bit is set to 0 during auto-programming and set to 1 when
autoprogramming completes.
When suspend function enabled, the FMR44 bit is set to 1 during auto-programming and set to 0 when
autoprogramming 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
18.4.5 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.
Figure 18.12 shows Program Command (When Suspend Function Disabled). Figure 18.13 shows Program
Command (When Suspend Function Enabled).
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 18.12
Program Command (When Suspend Function Disabled)
Start
Write the command code 40h to
the write address
Write data to the write address
FMR00 = 1?
Full status check
Program completed
No
Yes