24FC08-ESLASHST datasheet(12/49 Pages) MICROCHIP

12 / 49 page

24AA08/24LC08B/24FC08

DS20001710N-page 12

 2002-2021 Microchip Technology Inc.

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. ACK polling

can then be 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 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

24FC08-E/ST Datasheet(PDF) 12 Page - Microchip Technology