X88064

5

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

CE

ALE

WR

PSEN(RD)

A12=n

OPERATION

BYTE 0

BYTE 1

BYTE 2

LAST BYTE

READ (1)

NEXT WRITE OPERATION

7023 FRM F04

A12=n

A12=n

A12=n

A12=x

ADDR

Next Address