X88064PI datasheet(5/15 Pages) XICOR

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X88064

PAGE WRITE OPERATION

Regardless of the microcontroller employed, the X88064

supports page mode write operations. This allows the

microcontroller to write from one to thirty-two bytes of

data to the X88064. Each individual write within a page

write operation must conform to the byte write timing

requirements. The falling edge of WR starts a timer

delaying the internal programming cycle 100

µs. There-

fore, each successive write operation must begin within

100

µs of the last byte written. The following waveforms

illustrate the sequence and timing requirements.

Page Write Timing Sequence for WR Controller Operation

Notes: (1) For each successive write within a page write cycle A5–A12 must be the same.

tBLC

ALE

A/D0 –A/D 7

A8 –A12

PSEN(RD)

AIN

DIN

A12=n

OPERATION

BYTE 0

BYTE 1

BYTE 2

LAST BYTE

READ (1)

AFTER tWC READY FOR

NEXT WRITE OPERATION

tWC

7023 FRM F04

AIN

DIN

A12=n

AIN

DIN

A12=n

AIN

DIN

A12=n

AIN

DOUT

A12=x

AIN

ADDR

AIN

Next Address

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