HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 165

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

High-Speed, High-Reliability Programming: Unused areas of the flash memory in the
H8/3644F, H8/3643F, or H8/3642AF contain H'FF data (initial value). The flash memory uses a
high-speed, high-reliability programming procedure. This procedure provides higher programming
speed without subjecting the device to voltage stress and without sacrificing the reliability of the
programmed data.
Figure 6.20 shows the basic high-speed, high-reliability programming flowchart. Tables 6.17 and
6.18 list the electrical characteristics during programming.
156
Address + 1
Figure 6.20 High-Speed, High-Reliability Programming
address
No
Program-verify command
Program setup command
Set V
Program command
Set V
Last address?
PP
Verification?
Address = 0
Wait (25 s)
Wait (6 s)
n + 1
= 12.0 V 0.6 V
n = 0
Start
End
PP
= V
OK
Yes
n
CC
No good
n = 20?
Error
Yes
No