M28256-25NS1T(1999) 데이터 시트보기 (PDF) - STMicroelectronics

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M28256-25NS1T
(Rev.:1999)

256 Kbit (32K x 8) Parallel EEPROM With Software Data Protection

STMicroelectronics 

M28256

Figure 13. Software Protected Write Cycle Waveforms

G

E

W

A0-A5

A6-A14

DQ0-DQ7

tAVEL

tWLWH

tWHWL

tWHWH

tWLAX

Byte Address

tWHDX

5555h

2AAAh

5555h

Page Address

tDVWH

AAh

55h

A0h

Byte 0

Byte 62

Byte 63

AI01704

Note: A6 through A14 must specify the same page address during each high to low transition of W (or E) after the software code has been

entered. G must be high only when W and E are both low.

Figure 14. Data Polling Waveform Sequence

A0-A14

Address of the last byte of the Page Write instruction

E

G

W

DQ7

DQ7

LAST WRITE

DQ7

DQ7

DQ7

INTERNAL WRITE SEQUENCE

DQ7

READY

AI01705

14/21

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