Datasheet

24C02C

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 (R/W

= 0). If the device is still

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

If no ACK is returned, then the Start bit and control 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 Read or Write 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

Send Control Byte

with R/W

= 0

Did Device

Acknowledge

(ACK = 0)?

Operation

Yes