SH7144_08 Datasheet, PDF (841/930 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family/SH7144 Series

26. Electrical Characteristics
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 (t_p (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_se = 10 ms, N = 120 times
6. See appendix C, Product Code Lineup for correspondence of the standard product, wide
temperature-range product, and product model name.
7. All characteristics after rewriting are guaranteed up to this minimum rewriting times
(therefore 1 to min. times).
8. Reference value at 25°C (A rough rewriting target number to which a rewriting usually functions)
9. Data retention characteristics when rewriting is executed within the specification values including
minimum values.
Rev.4.00 Mar. 27, 2008 Page 797 of 882
REJ09B0108-0400