H8SLASH3021 datasheet(572/712 Pages) RENESAS

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18. Electrical Characteristics

Rev.2.00 Mar. 22, 2007 Page 548 of 684

REJ09B0352-0200

Item

Symbol

Min

Typ

Max

Unit

Comments

Erase

Wait time after SWE bit setting*

sswe

—

μs

Wait time after ESU bit setting*

sesu

100

—

μs

Wait time after E bit setting*

1,*5

100

Erase wait

time

Wait time after E bit clear*

—

μs

Wait time after ESU bit clear*

cesu

—

μs

Wait time after EV bit setting*

sev

—

μs

Wait time after H'FF dummy write*

sevr

—

μs

Wait time after EV bit clear*

cev

—

μs

Wait time after SWE bit clear*

cswe

100

—

μs

Maximum erase count*

1,*5

—

120

Times

Notes: 1. Set the times according to the program/erase algorithms.

2. Programming time per 128 bytes (Shows the total time the P bit in the flash memory

control register (FLMCR) is set. It does not include the programming verification time.)

3. Block erase time (Shows the period the E bit in FLMCR is set. It does not include the

erase verification time.)

4. To specify the maximum programming time (t

P(max)) in the 128-byte programming

flowchart, set the max value (1000) for the maximum programming count (N).

The wait time after P bit setting (t

sp) should be changed as follows according to the

programming counter value.

Programming counter value of 1 to 6:

sp30 = 30 μs

Programming counter value of 7 to 1000: t

sp200 = 200 μs

In case of an additional programming counter value (n) of 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):

E(max) = Wait time after E bit setting (tse) × 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

When t

se = 10 [ms], N = 120

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