Datasheet

Section 23 ROM (H8S/2148 F-ZTAT A-Mask Version, H8S/2147 F-ZTAT A-Mask Version, H8S/2144 F-ZTAT A-Mask Version)
Rev. 4.00 Sep 27, 2006 page 712 of 1130
REJ09B0327-0400
End of erasing
Start
Set SWE bit in FLMCR1
Set ESU bit in FLMCR2
Set E bit in FLMCR1
Wait (x) µs
Wait (y) µs
n = 1
Set EBR1, EBR2
Enable WDT
*
5
*
5
*
3
Wait (z) ms
*
5
Wait (α) µs
*
5
Wait (β) µs
*
5
Wait (γ) µs
Set block start address to verify address
*
5
Wait (ε) µs
*
5
*
2
*
5
Wait (η) µs
*
5
*
5
*
4
Start of erase
Clear E bit in FLMCR1
Clear ESU bit in FLMCR2
Set EV bit in FLMCR1
H'FF dummy write to verify address
Read verify data
Clear EV bit in FLMCR1
Wait (η) µs
Clear EV bit in FLMCR1
Clear SWE bit in FLMCR1
Disable WDT
Halt erase
*
1
Verify data = all 1?
Last address of block?
End of
erasing of all erase
blocks?
Erase failure
Clear SWE bit in FLMCR1
n ≥ N?
NG
NG
NG
NG
OK
OK
OK
OK
n ← n + 1
Increment
address
Wait (θ) µs Wait (θ) µs
Notes: 1. Preprogramming (setting erase block data to all 0) is not necessary.
2. Verify data is read in 16-bit (W) units.
3. Set only one bit in EBR1or EBR2. More than one bit cannot be set.
4. Erasing is performed in block units. To erase a number of blocks, the individual blocks must be erased sequentially.
5. See
section 26.2.6, Flash Memory Characteristics, for the values of x, y, z, α, β, γ, ε, η, θ , and N.
Figure 23.13 Erase/Erase-Verify Flowchart (Single-Block Erase)