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7641

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Mitsumi 

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MITSUBISHI MICROCOMPUTERS

7641 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Full Status Check

By performing full status check, it is possible to know the execu-

tion results of erase and program operations. Figure 101 shows a

full status check flowchart and the action to be taken when each

error occurs.

____

Ready/Busy (RY/BY) Pin

____

The RY/BY pin is an output pin (N-channel open drain output)

which, such as the sequencer status (SR7), indicates the operat-

ing status of the flash memory. It is “L” level (busy) during program

or erase operation and becomes the high impedance state (ready)

____

when these operations end. The RY/BY pin requires an external

pull-up operation.

Read status register

SR4 = 1 and YES

SR5 = 1 ?

Command

sequence error

NO

NO

SR5 = 0 ?

YES

NO

SR4 = 0 ?

YES

Erase error

Program error

Execute the clear status register command (5016)

to clear the status register. Try performing the

operation one more time after confirming that the

command is entered correctly.

Should a block erase error occur, the block in error

cannot be used.

Should a program error occur, the block in error

cannot be used.

End (Erase, program)

Note: When one of SR5 and SR4 is set to “1”, none of the program, erase all blocks,

and block erase commands is accepted. Execute the clear status register

command (5016) before executing these commands.

Fig. 101 Full status check flowchart and remedial procedure for errors

121

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