24LC61-IST datasheet(9/16 Pages) MICROCHIP

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24LCS61/62

Preliminary

DS21226A-page 9

5.3

Operation State Diagram

The diagram below shows the state diagram for basic

operation of the 24LCS61/62. This diagram shows pos-

sible states and operational ﬂow once power is applied

to the device. Table 5-1 summarizes operation of each

command for the assigned and unassigned states.

FIGURE 5-3:

OPERATIONAL STATE DIAGRAM

TABLE 5-1:

COMMAND SUMMARY TABLE

Power

Off

Unassigned

State

Assigned

State

Power Off

Power On

Power Off

Assign Address Command:

Device wins Arbitration

Clear Address

Command

Assign Address Command:

Device loses Arbitration

(ID byte not assigned yet)

(ID byte has been assigned)

Command

Result if Device Has Not Yet

Been Assigned an ID Byte

Result if Device Has Already Been

Assigned an ID Byte

Assign Address

command

If device wins arbitration, then ID

byte will become xxh. If device

loses arbitration, then ID byte will

revert back to 00h.

Device will not acknowledge command.

Clear Address

command

Device will remain with ID byte set

to 00h.

Device ID byte will revert back to 00h and will then

acknowledge Assign Address commands.

Read or Write

command with

ID byte set to 00h

Since the default ID byte for the

device is 00h, the device will exe-

cute the command.

Device will acknowledge the control byte, but it will not

acknowledge any further bytes and will not respond to

the command.

Read or Write

command with

ID byte set to xxh

(other than 00h)

Device will acknowledge the control

byte, but it will not acknowledge

any further bytes and will not

respond to the command.

If the device ID byte matches the ID byte in the command

(xxh), the device will execute the command. If the device

ID byte does not match the ID byte in the command, then

the device will acknowledge the control byte, but it will not

acknowledge any further bytes and will not respond to

the command.

Set Write Protect

command with

ID byte set to 00h

Since the default ID address for the

device is 00h, the device will exe-

cute the command.

Device will acknowledge the control byte, but it will not

acknowledge any further bytes and will not respond to

the command.

Set Write Protection

command with

ID byte set to xxh

(other than 00h)

Device will acknowledge the control

byte, but it will not acknowledge

any further bytes and will not

respond to the command.

If the device ID byte matches the ID byte in the command

(xxh), the device will execute the command. If the device

ID byte does not match the ID byte in the command, then

the device will acknowledge the control byte, but it will not

acknowledge any further bytes and will not respond to

the command. Note: Once this command has been exe-

cuted successfully for a device, the device will no longer

acknowledge any part of this command again.

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