24LC00T-SLASHST datasheet(12/22 Pages) MICROCHIP

12 / 22 page

24LCS61/24LCS62

DS21226E-page 12

 2004 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 master, the device

initiates the internally timed write cycle. ACK polling

can be initiated immediately. This involves the master

sending a Start condition followed by the control byte

for a Write command and then sending the Device ID

byte for that particular device. If the device is still busy

with the write cycle, then no ACK will be returned after

the Device ID byte. If no ACK is returned, then the Start

bit, control byte and ID byte must be re-sent. If the cycle

is complete, then the device will return the ACK and the

master can then proceed with the next command. See

Figure 7-1 for flow diagram.

FIGURE 7-1:

ACKNOWLEDGE

POLLING FLOW

Send

Write Command

Send Stop

Condition to

Initiate Write Cycle

Send Start

Did Device

Acknowledge

(ACK = 0)?

Operation

YES

Send Control byte and

Device ID byte

Device ID

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