ATAM862 datasheet(98/110 Pages) ATMEL

98 / 110 page

4554E–4BMCU–05/06

ATAM862-3

24.7.4

Write One Data Byte

24.7.5

Write Two Data Bytes

24.7.6

Write Control Byte Only

24.7.7

Write Control Bytes

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

24.7.8

Read Operations

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

cally 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.

Start

Control byte

Data byte 1

Stop

Start

Control byte

Data byte 1

Data byte 2

Stop

Start

Control byte

Stop

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)

ATAM862 Datasheet(PDF) 98 Page - ATMEL Corporation

ATAM862 Datasheet(HTML) 98 Page - ATMEL Corporation

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