M58BF008

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Figure 14. Erase Flowchart and Pseudo Code

Note: 1. If an error is found, the Status Register must be cleared (CLRS instruction) before further P/E.C. operations.

Write 20h/02h

Command

AI02680

Start

Write Block Address

& D0h Command

Read Status

Register

YES

NO

b7 = 1

YES

NO

b3 = 0

NO

b4, b5 = 0

VPP Invalid

Error (1)

Command

Sequence Error

EE/OBEE instructions:

– write 20h/02h command

– write Block Address

(A12-A17) & command D0h/0Dh

(memory enters read status

state after the EE instruction)

do:

– read status register

(E or G must be toggled)

while b7 = 1

If b3 = 1, VPP invalid error:

– error handler

If b4, b5 = 1, Command Sequence error:

– error handler

YES

NO

b5 = 0

Erase

Error (1)

If b5 = 1, Erase error:

– error handler

YES

End

YES