STK1743

March 1999

7-6

SOFTWARE MODE SELECTION

Note l:

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

SOFTWARE CYCLES #1 & #2m, n

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

NOTES

LH

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

l

LH

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

l

NO.

SYMBOLS

PARAMETER

STK1743-25

STK1743-35

STK1743-45

UNITS

#1

MIN

MAX

MIN

MAX

MIN

MAX

27

25

35

45

ns

28

m

Address Set-up Time

0

0

0

ns

29

m

Clock Pulse Width

20

25

30

ns

30

g, m

Address Hold Time

20

20

20

ns

31

20

20

20

µs

HIGH IMPEDENCE

ADDRESS #6

ADDRESS #1

DATA VALID

27

DATA VALID

23

31

27

28

29

30

E

ADDRESS

DQ (DATA OUT)