CHAPTER 16 FLASH MEMORY
User’s Manual U18172EJ2V0UD
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(4) Flash programming command register (FLCMD)
This register is used to specify whether the flash memory is erased, written, or verified in the self-programming
mode.
This register is set by using a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 16-13. 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 1
This command is used to check if
data has been correctly written to the
flash memory. It is used to check
whether data has been written to an
entire block. If an error occurs, bit 1
(VCERR) or bit 2 (WEPRERR) of the
flash status register (PFS) is set to 1.
Internal verify 2
This command is used to check if
data has been correctly written to the
flash memory. It is used to check
whether data has been written in the
same block. 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 any command other than those above is executed, command execution may immediately be
terminated, and bit 1 or 2 (WEPRERR or VCERR) of the flash status register (PFS) may be set to 1.