24CS512-ESLASHP datasheet(15/66 Pages) MICROCHIP

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DS20005769C-page 15

24CS512

6.0

WRITE OPERATIONS

All write operations for the 24CS512 begin with the host

sending a Start condition, followed by a device address

byte with the R/W bit set to a logic ‘0’ and then by the

word address bytes. The data value(s) to be written to

the device immediately follow the word address bytes.

6.1

Byte Write

The 24CS512 supports the writing of a single 8-bit byte.

Selecting a data byte in the 24CS512 requires a 16-bit

word address.

Upon receipt of the proper device address and the

word address bytes, the EEPROM will send an

Acknowledge. The device will then be ready to receive

the 8-bit data byte. Following the receipt of the data

byte, the EEPROM will respond with an Acknowledge.

The addressing device, such as a host, must then ter-

minate the write operation with a Stop condition. At that

time, the EEPROM will enter an internally self-timed

write cycle, which will be completed within TWC, while

the data byte is being programmed into the nonvolatile

EEPROM. All inputs are disabled during this write cycle

and the EEPROM will not respond until the write

operation is complete.

If an attempt is made to write to a write-protected

portion of the array, no data will be written and the

device will immediately accept a new command.

FIGURE 6-1:

BYTE WRITE

SCL

MSb

A15 A14

A12 A11 A10 A9

A13

SDA

MSb

A1 A0

D3 D2

D1 D0

MSb

Device Address Byte

Word Address – Byte 0

ACK

from

Client

ACK

from

Client

Start

Host

Data Byte

Word Address – Byte 1

ACK

from

Client

ACK

from

Client

Stop

Host

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