24LC64-E/SNG Microchip, 24LC64-E/SNG Datasheet - Page 9

• Manufacturer Part Number: 24LC64-E/SNG
• Description: Ic
• Manufacturer: Microchip

5.0
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 and ACK polling
can then 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, the Start bit and control byte must
be re-sent. If the cycle is complete, the device will
return the ACK and the master can then proceed with
the next Read or Write command. See Figure 5-1 for a
flow diagram of this operation.
 2003 Microchip Technology Inc.
ACKNOWLEDGE POLLING
FIGURE 5-1:
24AA64/24LC64
Initiate Write Cycle
Send Control Byte
Write Command
with R/W = 0
Condition to
Acknowledge
Send Stop
Send Start
Did Device
(ACK = 0)?
Operation
Send
Next
ACKNOWLEDGE POLLING
FLOW
YES
NO
DS21189H-page 9