M28W320 STMicroelectronics, M28W320 Datasheet - Page 32

• Manufacturer Part Number: M28W320
• Description: 32 Mbit 2Mb x16/ Boot Block Low Voltage Flash Memory
• Manufacturer: STMicroelectronics

M28W320CT, M28W320CB
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.
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Write Block Address
& D0h Command
Read Status
Command
b4, b5 = 0
Write 20h
Register
b7 = 1
b3 = 0
b5 = 0
b1 = 0
Start
End
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
Suspend
Sequence Error (1)
Erase to Protected
Erase Error (1)
Block Error (1)
V PP Invalid
Command
NO
Error (1)
YES
Suspend
Loop
EE instruction:
– write 20h command
– write Block Address (A12-A20) &
do:
– read status register (E or G must be
while b7 = 1
If b3 = 1, V PP invalid error:
– error handler
If b4, b5 = 1, Command sequence error:
– error handler
If b5 = 1, Erase error:
– error handler
If b1 = 1, Erase to protected block error:
– error handler
command D0h
(memory enters read status state after
the EE instruction)
toggled) if PES instruction given execute
suspend erase loop
AI03541