24AA01-/SM データシートの表示（PDF） - Microchip Technology

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24AA01-/SM

1K I2C™ Serial EEPROM

Microchip Technology 

24AA01/24LC01B

5.0 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 com-

mand has been issued from the master, the device ini-

tiates the internally timed write cycle. ACK polling can

be initiated immediately. This involves the master send-

ing 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 flow diagram.

FIGURE 5-1: ACKNOWLEDGE POLLING

FLOW

Send

Write Command

Send Stop

Condition to

Initiate Write Cycle

Send Start

6.0 WRITE PROTECTION

The 24XX01 can be used as a serial ROM when the

WP pin is connected to VCC. Programming will be

inhibited and the entire memory will be write-protected.

Send Control Byte

with R/W = 0

Did Device

Acknowledge

No

(ACK = 0)?

Yes

Next

Operation

DS21711A-page 8

 2002 Microchip Technology Inc.

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