24LC16B datasheet(8/24 Pages) MICROCHIP

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24LC16B

DS20006054B-page 8

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6.0

WRITE OPERATION

6.1

Byte Write

Following the Start condition from the host, the device

code (4 bits), the block address (3 bits) and the R/W bit,

which is a logic-low, are placed onto the bus by the host

transmitter. This indicates to the addressed client

receiver that a byte with a word address will follow once

it has generated an Acknowledge bit during the ninth

clock cycle. Therefore, the next byte transmitted by the

host is the word address and will be written into the

Address Pointer of the 24LC16B. After receiving

another Acknowledge signal from the 24LC16B, the

host device will transmit the data word to be written into

the addressed memory location. The 24LC16B

acknowledges again and the host generates a Stop

condition. This initiates the internal write cycle and,

during this time, the 24LC16B will not generate

Acknowledge signals (Figure 6-1).

6.2

Page Write

The write control byte, word address and the first data

byte are transmitted to the 24LC16B in the same way

as in a byte write. However, instead of generating a

Stop condition, the host transmits up to 16 data bytes

to the 24LC16B, which are temporarily stored in the

on-chip page buffer and will be written into memory

once the host has transmitted a Stop condition. Upon

receipt of each word, the four lower-order Address

Pointer bits, which form the byte counter, are internally

incremented by one.

The higher-order 7 bits of the word address remain

constant. If the host should transmit more than 16 bytes

prior to generating the Stop condition, the Address

Pointer will roll over and the previously received data

will be overwritten. As with the byte write operation,

once the Stop condition is received an internal write

cycle will begin (Figure 6-2).

6.3

Write Protection

The WP pin allows the user to write-protect the entire

array (000-7FF) when the pin is tied to VCC. If tied to

VSS the write protection is disabled.

FIGURE 6-1:

BYTE WRITE

FIGURE 6-2:

PAGE WRITE

Note:

Page write operations are limited to

writing bytes within a single physical page,

regardless of the number of bytes

actually being written. Physical page

boundaries start at addresses that are

integer multiples of the page buffer size

(or ‘page-size’) and end at addresses that

are integer multiples of page size – 1. If a

page write command attempts to write

across a physical page boundary, the

result is that the data wrap around to the

beginning of the current page (overwriting

data previously stored there), instead of

being written to the next page, as might be

expected. It is therefore necessary for the

application software to prevent page write

operations that would attempt to cross a

page boundary.

Bus Activity

Host

SDA Line

Bus Activity

Control

byte

Word

Address

Data

10 1 0 B2 B1 B0 0

Block

Select

bits

Bus Activity

Host

SDA Line

Bus Activity

Control

byte

Word

Address

Data (n)

Data (n + 15)

Data (n + 1)

1 0 1 0

Block

Select

bits

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