Cypress Semiconductor STK14C88-5 Manual de usuario descargar pdf (Pagina 10)

STK14C88

Document Number: 001-52038 Rev. *D Page 10 of 21

Software STORE/RECALL Mode Selection

E W A

- A

(hex) Mode I/O POWER Notes

L H 0E38

31C7

03E0

3C1F

303F

Read SRAM

Output Data

Active

17, 21, 22, 23

0FC0 Nonvolatile STORE Output High Z I

CC2

L H 0E38

31C7

03E0

3C1F

303F

0C63

Read SRAM

Nonvolatile RECALL

Output Data

Output High Z

Active 17, 21, 22, 23

Software-Controlled STORE/RECALL Cycle

NO.

Symbols

Parameter

STK14C88-25 STK14C88-35 STK14C88-45

Unit Notes

Standard Alt. Min Max Min Max Min Max

33 t

AVAV

STORE/RECALL initiation cycle time 35 – 45 – 55 – ns 17

34 t

AVEL

Address setup time 0 – 0 – 0 – ns 24, 25

35 t

ELEH

Clock pulse width 25 – 30 – 35 – ns 24, 25

36 t

ELAX

Address hold time 20 – 20 – 20 – ns 24, 25

37 t

RECALL

RECALL duration – 20 – 20 – 20 s–

Figure 10. E

Controlled Software STORE/RECALL Cycle

[25]

Notes

21. The six consecutive addresses must be in the order listed. W

must be high during all six consecutive E controlled cycles to enable a nonvolatile cycle.

22. While there are 15 addresses on the STK14C88, only the lower 14 are used to control software modes.

23. I/O state assumes G

< V

. Activation of nonvolatile cycles does not depend on state of G.

24. The software sequence is clocked on the falling edge of E

controlled reads without involving G (double clocking aborts the sequence).

25. The six consecutive addresses must be in the order listed in the Software STORE/RECALL Mode Selection Table: (0E38, 31C7, 03E0, 3C1F, 303F, 0FC0) for a STORE

cycle or (0E38, 31C7, 03E0, 3C1F, 303F, 0C63) for a RECALL cycle. W

must be high during all six consecutive cycles.

DATA VALID

HIGH IMPEDANCE

ADDRESS #6ADDRESS #1

DATA VALID

AVAV

DATA VALID

DQ (DATA

ADDRESS

29 37

STORE

/ t

RECALL

AVAV

AVEL

ELEH

ELAX

Not Recommended for New Designs

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 21 22

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Cypress Semiconductor STK14C88-5 Manual de usuario Pagina 10

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