Hitachi H8/3048 Hardware Manual page 627

High-Speed, High-Reliability Programming: Unused areas of the H8/3048F flash memory
contain H'FF data (initial value). The H8/3048F flash memory uses a high-speed, high-reliability
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programming procedure. This procedure provides enhanced programming speed without
subjecting the device to voltage stress and without sacrificing the reliability of programmed data.
Figure 18-23 shows the basic high-speed, high-reliability programming flowchart. Tables 18-22
and 18-23 list the electrical characteristics during programming.
Address + 1 → address
Figure 18-23 High-Speed, High-Reliability Programming
Start
= 12.0 V ±0.6 V
Set V
PP
Address = 0
n = 0
n + 1 → n
Program setup command
Program command
Wait (25 µs)
Program-verify command
Wait (6 µs)
Verification?
OK
No
Last address?
Yes
Set V = V
PP CC
End
618
No good
n = 20?
Yes
Fail
No