HD6433640 HITACHI [Hitachi Semiconductor], HD6433640 Datasheet - Page 141

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

6.7.3
Flowchart for Programming One Byte
132
(set bit for block to be programmed to 1)
(clear bit for programmed block to 0)
(flash memory latches write address
End (1-byte data programmed)
Select program-verify mode
Write data to flash memory
Clear erase block register
Enable watchdog timer
Disable watchdog timer
Programming Flowchart and Sample Program
Set erase block register
(PV bit = 1 in FLMCR)
Select program mode
(P bit = 1 in FLMCR)
Wait (t
(read memory)
Wait (x) s
Clear PV bit
and data)
Clear P bit
Verify
Start
n = 1
vs1
OK
) s
*3
*1
*4
*5
*2
Figure 6.14 Programming Flowchart
NG
End of programming
Programming error
Clear PV bit
n
Notes: 1. Write the data to be programmed using a byte
N?
Yes
*5
2. For the timer overflow interval, set the timer
3. Read the memory data to be verified using a
4. Programming time x is successively
5. t
transfer instruction.
counter value (TCW) to H'FE.
byte transfer instruction.
incremented to initial set value
6). The initial value should therefore be set to
15.8 s or less to make the total programming
time 1 ms or less.
N:
vs1
: 4 s or more
6 (set N so that total programming time
does not exceed 1 ms)
End of verify
No
Double the programming time
(x
n + 1
2
x)
n
2
n–1
(n = 1 to