CHAPTER 18 FLASH MEMORY
User’s Manual U16898EJ3V0UD
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Figure 18-15. Format of Flash Programming Command Register (FLCMD)
Address: FFA3H After reset: 00H R/W
Symbol
7 6 5 4 3 2 1 0
FLCMD
0 0 0 0 0
FLCMD2
FLCMD1
FLCMD0
FLCMD2 FLCMD1 FLCMD0 Command
Name
Function
0
0
1
Internal verify
This command is used to check if
data has been correctly written to the
flash memory. After data has been
written to the memory, execute this
command by specifying a block
number, start address, and end
address. If an error occurs, bit 1
(VCERR) or bit 2 (WEPRERR) of the
flash status register (PFS) is set to 1.
0
1
1
Block erase
This command is used to erase
specified block. It is used both in the
on-board mode and self
programming mode.
1
0
0
Block blank check This command is used to check if the
specified block has been erased.
1
0
1
Byte write
This command is used to write 1-byte
data to the specified address in the
flash memory. Specify the write
address and write data, then execute
this command.
If 1 is written to a bit that has not
been erased (a bit for which the data
is 0), then bit 2 (WEPRERR) of the
flash status register (PFS) becomes
1.
Other than above
Note
Setting
prohibited
Note
If a value other than the above is set and the self programming mode is set, the self programming
mode is canceled immediately and no execution occurs. At this time, the flag of the PFS register is
not set.
(5) Flash address pointers H and L (FLAPH and FLAPL)
These registers are used to specify the start address of the flash memory when the memory is erased, written,
or verified in the self programming mode.
FLAPH and FLAPL consist of counters, and they are incremented until the values match with those of
FLAPHC and FLAPLC when the programming command is not executed. When the programming command
is executed, therefore, set the value again.
These registers are set with a 1-bit or 8-bit memory manipulation instruction.
reset signal generation makes these registers undefined.