24CSM01 datasheet(33/63 Pages) MICROCHIP

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Preliminary

DS20006781B

-page 33

24CSM01

10.4.2

DETERMINING THE LOCK STATE

OF THE SECURITY REGISTER

The check lock operation follows the same sequence

as the lock operation (including ‘0110b’ in the A11

through A8 bits of the word address) with the exception

that only the device address byte and the first word

address byte (byte 0) need to be transmitted to the

device. An ACK response to the word address byte

indicates the lock has not been set while a NACK

response indicates the lock has been set. If the lock

has already been set, it cannot be undone. The check

lock operation is completed when the host sends a

Stop condition to the device. This sequence is shown in

Figure 10-4.

FIGURE 10-4:

DETERMINING THE SECURITY REGISTER LOCK STATE

Note:

Only the device address byte and the first

word address byte (byte 0) should be sent

to determine the lock state of the Security

address byte (byte 1) and a data byte can

inadvertently lock the Security register.

MSb

Device Address Byte

Word Address – Byte 0

A2 A1 x

0 0/1

ACK from

Client if

Unlocked

ACK

from

Client

Start by

Host

Stop by

Host

NACK from

Client if

Locked

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