T48C862x-Rf-TNQ datasheet(92/107 Pages) ATMEL

92 / 107 page

T48C862-R4 [Preliminary]

4551C–4BMCU–01/04

Write Control Bytes

A -> acknowledge; HB: high byte; LB: low byte; R: row address

Read Operations

The EEPROM allows byte-, word- and current address read operations. The read oper-

ations are initiated in the same way as write operations. Every read access is initiated by

sending the START condition followed by the control byte which contains the address

and the read mode. When the device has received a read command, it returns an

acknowledge, loads the addressed word into the read/write buffer and sends the

selected data byte to the master. The master has to acknowledge the received byte if it

wants to proceed the read operation. If two bytes are read out from the buffer the device

increments respectively decrements the word address automatically and loads the

buffer with the next word. The read mode bits determines if the low or high byte is read

first from the buffer and if the word address is incremented or decremented for the next

read access. If the memory address limit is reached, the data word address will roll over

and the sequential read will continue. The master can terminate the read operation after

every byte by not responding with an acknowledge (N) and by issuing a stop condition.

Read One Data Byte

Read Two Data Bytes

Read n Data Bytes

MSB

LSB

Write low byte first

R/NW

Row address

Byte order

LB(R)

HB(R)

MSB

LSB

Write high byte first

R/NW

Row address

Byte order

HB(R)

LB(R)

Start

Control byte

Data byte 1

Stop

Start

Control byte

Data byte 1

Data byte 2

Stop

Start

Control byte

Data byte 1

Data byte 2

–

Data byte n

N Stop

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