24LC41A-SLASHP datasheet(11/18 Pages) MICROCHIP

11 / 18 page

 2003 Microchip Technology Inc.

DS21176D-page 11

24LC41A

5.0

ACKNOWLEDGE POLLING

Acknowledge polling can be done for both the DDC

Monitor Port (when in Bidirectional mode) and the

Microcontroller Access Port.

Since the port 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 but

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 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 5-1 for the flow diagram.

FIGURE 5-1:

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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