HD6432646 Hitachi, HD6432646 Datasheet - Page 722

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

688
Notes: *1 Prewriting (setting erase block data to all 0s) is not necessary.
*2 Verify data is read in 16-bit (word) units.
*3 Make only a single-bit specification in the erase block registers (EBR1 and EBR2). Two or more bits must not be set simultaneously.
*4 Erasing is performed in block units. To erase multiple blocks, each block must be erased in turn.
*5 The wait times and the value of N are shown in section 23.7, Flash Memory Characteristics.
Figure 20-12 Erase/Erase-Verify Flowchart (Single Block Erase)
Increment
address
No
Set block start address as verify address
H'FF dummy write to verify address
Clear ESU bit in FLMCR1
Clear SWE bit in FLMCR1
Set SWE bit in FLMCR1
Set ESU bit in FLMCR1
Clear EV bit in FLMCR1
Clear E bit in FLMCR1
Set EV bit in FLMCR1
Last address of block?
Set E bit in FLMCR1
Set EBR1 or EBR2
Verify data = all 1s?
Read verify data
Wait (t
Wait (t
End of erasing
Wait (t
Wait (t
Wait (t
Disable WDT
Wait (t
Wait (t
Wait (t
Enable WDT
Wait (t
n = 1
Start
sswe
cswe
sesu
cesu
sevr
sev
se
cev)
ce
Yes
Yes
) ms
) s
) s
) s
) s
) s
) s
) s
s
*1
No
*5
*3, *4
*5
Start of erase
*5
Erase halted
*5
*5
*5
*5
*2
*5
*5
Perform erasing in block units.
Clear SWE bit in FLMCR1
Clear EV bit in FLMCR1
Wait (t
Wait (t
Erase failure
n
cswe
cev
(N)?
Yes
) s
) s
*5
No
n
*5
*5
n + 1