24LC024 datasheet(12/41 Pages) MICROCHIP

12 / 41 page

24AA024/24LC024/24AA025/24LC025

DS20001210Q-page 12

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7.0

ACKNOWLEDGE POLLING

Since the device will not acknowledge during a write

cycle, this can be used to determine when the cycle is

complete (this feature can be used to maximize bus

throughput). Once the Stop condition for a write

command has been issued from the host, the device

initiates the internally timed write cycle, with ACK

polling being initiated immediately. This involves the

host sending a Start condition, followed by the control

byte for a write command (R/W = 0). If the device is still

busy with the write cycle, no ACK will be returned. If no

ACK is returned, the Start bit and control byte must be

resent. If the cycle is complete, the device will return

the ACK and the host can then proceed with the next

read or write operation. See Figure 7-1 for a flow

diagram of this operation.

FIGURE 7-1:

ACKNOWLEDGE

POLLING FLOW

Send

Write Command

Send Stop

Condition to

Initiate Write Cycle

Send Start

Send Control Byte

with R/W = 0

Did Device

Acknowledge

(ACK = 0)?

Operation

Yes

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