HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 166

• Manufacturer Part Number: HD6433640
• Description: H8/3644 Series Hardware Manual
• Manufacturer: HITACHI [Hitachi Semiconductor]

High-Speed, High-Reliability Erasing: The flash memory in the H8/3644F, H8/3643F, and
H8/3642AF uses a high-speed, high-reliability erasing procedure. This procedure provides higher
erasing speed without subjecting the device to voltage stress and without sacrificing the reliability
of data reliability.
Figure 6.21 shows the basic high-speed, high-reliability erasing flowchart. Tables 6.17 and 6.18
list the electrical characteristics during erasing.
Note: * Follow the high-speed, high-reliability programming flowchart in programming all bits.
Address + 1
If 0 has already been written, perform programming for unprogrammed bits.
address
Figure 6.21 High-Speed, High-Reliability Erasing
No
Erase setup/erase command
Erase-verify command
Program all bits to 0 *
Last address?
Wait (10 ms)
Verification?
Address = 0
Wait (6 s)
n + 1
n = 0
Start
End
OK
Yes
n
No good
n = 3000?
Error
Yes
No
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