STK15C68

4-66

SOFTWARE MODE SELECTION

Note l:

The six consecutive addresses must be in order listed. W must be high during all six consecutive cycles to enable a nonvolatile cycle.

Note m: The software sequence is clocked with E controlled reads.

Note n:

The six consecutive addresses must be in the order listed in the SOFTWARE MODE SELECTION Table - (0000, 1555, 0AAA, 1FFF, 10F0,

0F0F) for a STORE cycle or (0000, 1555, 0AAA, 1FFF, 10F0, 0F0E) for a RECALL cycle. W must be high during all six consecutive cycles.

SOFTWARE CYCLE: E CONTROLLED

E

W

MODE

I/O with G Low

I/O with G High

NOTES

LH

X

0000

1555

0AAA

1FFF

10F0

0F0F

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Nonvolatile

STORE

Output data

Output data

Output data

Output data

Output data

Output high Z

Output High Z

Output High Z

Output High Z

Output High Z

Output High Z

Output High Z

l

LH

X

0000

1555

0AAA

1FFF

10F0

0F0E

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Read SRAM

Nonvolatile

RECALL

Output data

Output data

Output data

Output data

Output data

Output high Z

Output High Z

Output High Z

Output High Z

Output High Z

Output High Z

Output High Z

l

NO.

SYMBOLS

PARAMETER

STK15C68-25

STK15C68-35

STK15C68-45

UNITS

#1

MIN

MAX

MIN

MAX

MIN

MAX

27

25

35

45

ns

28

g,m

End of Sequence to Outputs Inactive

650

650

650

ns

29

m

Address Set-up Time

0

0

0

ns

30

m

Clock Pulse Width

20

25

30

ns

31

g,m

Address Hold Time

20

20

20

ns

32

Recall Cycle Duration

20

20

20

µs

28

32

23

31

30

29

27

27

DATA VALID

DQ(Data Out)

ELQZ

t

RECALL

DATA VALID

t

STORE

t

HIGH IMPEDANCE

ELAX

t

ELEH

AVEL

AVAV

AVAV

t

E

t

t

ADDRESS #1

t

ADDRESS #6

ADDRESS