M38503MXH Datasheet, PDF (43/86 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
3850 Group (Spec. H)
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
Program Command (4016)
Program operation starts when the command code “4016” is written
in the first bus cycle. Then, if the address and data to program are
written in the 2nd bus cycle, program operation (data programming
and verification) will start.
Whether the write operation is completed can be confirmed by read-
_____
ing the status register or the RY/BY status flag. When the program
starts, the read status register mode is accessed automatically and
the content of the status register is read into the data bus (D0–D7).
The status register bit 7 (SR7) is set to “0” at the same time the write
operation starts and is returned to “1” upon completion of the write
operation. In this case, the read status register mode remains active
until the read array command (FF16) is written.
____
The RY/BY status flag is “0” during write operation and “1” when the
write operation is completed as is the status register bit 7.
At program end, program results can be checked by reading the sta-
tus register.
Erase All Blocks Command (2016/2016)
By writing the command code “2016” in the first bus cycle and the
confirmation command code “2016” in the second bus cycle that fol-
lows, the system starts erase all blocks( erase and erase verify).
Whether the erase all blocks command is terminated can be con-
____
firmed by reading the status register or the RY/BY status flag. When
the erase all blocks operation starts, the read status register mode is
accessed automatically and the content of the status register can be
read out. The status register bit 7 (SR7) is set to “0” at the same time
the erase operation starts and is returned to “1” upon completion of
the erase operation. In this case, the read status register mode re-
mains active until the read array command (FF16) is written.
____
The RY/BY status flag is “0” during erase operation and “1” when the
erase operation is completed as is the status register bit 7.
At erase all blocks end, erase results can be checked by reading the
status register. For details, refer to the section where the status reg-
ister is detailed.
Start
Write 4016
Write ^{Write address}
Write data
Status register
read
SR7=1?
NO
or
RY/BY=1?
YES
NO
SR4=0?
YES
Program
completed
Program
error
Fig. 47 Program flowchart
Block Erase Command (2016/D016)
By writing the command code “2016” in the first bus cycle and the
confirmation command code “D016” in the second bus cycle that
follows to the block address of a flash memory block, the system
initiates a block erase (erase and erase verify) operation.
Whether the block erase operation is completed can be confirmed
____
by reading the status register or the RY/BY status flag. At the same
time the block erase operation starts, the read status register mode
is automatically entered, so the content of the status register can be
read out. The status register bit 7 (SR7) is set to “0” at the same time
the block erase operation starts and is returned to “1” upon comple-
tion of the block erase operation. In this case, the read status regis-
ter mode remains active until the read array command (FF16) is writ-
ten.
____
The RY/BY status flag is “0” during block erase operation and “1”
when the block erase operation is completed as is the status register
bit 7.
After the block erase operation is completed, the status register can
be read out to know the result of the block erase operation. For de-
tails, refer to the section where the status register is detailed.
Start
Write 2016
Write
2016/D016
Block address
Status register
read
2016:Erase all blocks
D016:Block erase
SR7=1?
NO
or
RY/BY=1?
YES
NO
SR5=0?
YES
Erase completed
Erase error
Fig. 48 Erase flowchart
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