SH7144 Datasheet, PDF (735/773 Pages) Renesas Technology Corp – Hitachi SuperH RISC engine

Item
Symbol Min Typ Max Unit
Remarks
Erase
Wait time after SWE bit setting*¹ t_sswe
Wait time after ESU bit setting*¹ t_sesu
Wait time after E bit setting*^1, *⁵
t_se
1
1
— µs
100 100 — µs
10 10 100 ms
Erase time
wait
Wait time after E bit clear*¹
t_ce
Wait time after ESU bit clear*¹
t_cesu
Wait time after EV bit setting*¹
t_sev
Wait time after H'FF dummy write*¹ t_sevr
Wait time after EV bit clear*¹
t_cev
Wait time after SWE bit clear*¹
t_cswe
Maximum erase count*^1, *⁵
N
10 10 — µs
10 10 — µs
20 20 — µs
2
2
— µs
4
4
— µs
100 100 — µs
12 — 120 Times
Notes: 1. Make each time setting in accordance with the program/program-verify algorithm or
erase/erase-verify algorithm.
2. Programming time per 128 bytes (shows the total period for which the P-bit in the flash
memory control register (FLMCR1) is set. It does not include the programming
verification time.)
3. 1-Block erase time (shows the total period for which the E-bit in FLMCR1 is set. It does
not include the erase verification time.)
4. To specify the maximum programming time value (tp (max)) in the 128-bytes
programming algorithm, set the max. value (1000) for the maximum programming count
(N).
The wait time after P bit setting should be changed as follows according to the value of
the programming counter (n).
Programming counter (n) = 1 to 6:
t_sp30 = 30 µs
Programming counter (n) = 7 to 1000:
t
sp200
=
200
µs
[In additional programming]
Programming counter (n) = 1 to 6:
t_sp10 = 10 µs
5. For the maximum erase time (t_E (max)), the following relationship applies between the
wait time after E bit setting (t_se) and the maximum erase count (N):
t_E(max) = Wait time after E bit setting (t_se) x maximum erase count (N)
To set the maximum erase time, the values of (t_se) and (N) should be set so as to satisfy
the above formula.
Examples: When t_se = 100 ms, N = 12 times
When t = 10 ms, N = 120 times
se
6. The minimum times that all characteristics after rewriting are guaranteed. (A range
between 1 and minimum value is guaranteed.)
7. The reference value at 25°C. (Normally, it is a reference that rewriting is enabled up to
this value.)
Rev. 2.0, 09/02, page 695 of 732