HD6432646 Hitachi, HD6432646 Datasheet - Page 718

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

5. The period for which the P bit in FLMCR1 is set (the write pulse width) should be changed
Item
Wait time after
P bit setting
Note: * Additional programming processing is necessary only when the reprogramming loop count
6. The program/program-verify flowchart for the LSI is shown in figure 20-11.
684
c. If programming of other bits is incomplete in the 128 bytes, reprogramming processing
according to the degree of progress through the program/program-verify procedure. For
detailed wait time specifications, see section 23.7, Flash Memory Characteristics.
To cover the points noted above, bits on which reprogramming processing is to be executed,
and bits on which additional programming is to be executed, must be determined as shown
below.
Since reprogram data and additional-programming data vary according to the progress of the
programming procedure, it is recommended that the following data storage areas (128 bytes
each) be provided in RAM.
When programming is completed at an early stage in the program/program-verify
procedure:
If programming is completed in the 1st to 6th reprogramming processing loop, additional
programming should be performed on the relevant bits. Additional programming should
only be performed on bits which first return 0 in a verify-read in certain reprogramming
processing.
When programming is completed at a late stage in the program/program-verify procedure:
If programming is completed in the 7th or later reprogramming processing loop, additional
programming is not necessary for the relevant bits.
should be executed. If a bit for which programming has been judged to be completed is
read as 1 in a subsequent verify-read, a write pulse should again be applied to that bit.
(n) is 1 to 6.
Symbol
t
sp
Item
When reprogramming loop count (n) is 1 to 6
When reprogramming loop count (n) is 7 or more
In case of additional programming processing*
Symbol
t
t
t
sp30
sp200
sp10