ATSHA204A datasheet(25/93 Pages) MICROCHIP

25 / 93 page

The device uses the selector byte within the configuration zone to determine which device stays awake.

Only that device with a selector value that matches the input parameter of the Pause command stays

awake. In order to facilitate late configuration of systems that use the multi-device sharing mode, the

following three update capabilities for the selector byte are supported:

Unlimited Updates

At any time, the UpdateExtra command can be executed to write the value in the selector field of

the Configuration zone. To enable this mode, set the SelectorMode byte in the Configuration zone

to zero.

One-time Field Update

If the SelectorMode byte is set to a non-zero value and the selector byte is set to a zero value prior

to locking the Configuration zone. Then, at any time after the Configuration zone is locked the

UpdateExtra command can be used one time to set Selector to a non-zero value. The

UpdateExtra command is not affected by the LockValue byte.

Fixed Selector Value

The selector byte can never be modified after the Configuration zone is locked if both SelectorMode

and Selector are set to non-zero values. The UpdateExtra command always returns an error

code.

5.5

Transaction Example

Wake (Single-Wire)

Host

Device

Wake

→

Transmit

→

←

Data

Example (Single-Wire)

Host

Device

Wake

→

Transmit

→

←

Data

Command

→

Data

→

Transmit

→

←

Data

Idle/Sleep

→

Table 5-3. Example (Single-Wire)

Wake Token 0x00

Transmit 0x88

Count 0x04

Status 0x11

Host

0 0 0 1 0 0 0 1

Device

0 0 1 0 0 0 0 0 1 0 0 0 1 0 0 0

ATSHA204A

Single-Wire Interface

DS40002025A-page 25

ATSHA204A Datasheet(PDF) 25 Page - Microchip Technology

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