Rainbow-electronics DS2482-800 Manual do Utilizador descarregar pdf (Página 20)

DS2482-800: Eight-Channel 1-Wire Master

20 of 22

Case C: 1-Wire idle (1WB = 0), busy polling until the 1-Wire Command is completed.

S AD,0 A 1WRB A

Sr AD,1 A <byte> A <byte> A\

Sr AD,0 A SRP A E1h A Sr AD,1 A <byte> A\ P

Poll the Status Register until the 1WB bit has changed from 1 to 0. Then set the read pointer to the read data

channel.

Case D: 1-Wire busy (1WB = 1)

S AD,0 A 1WRB A\ P

The master should stop and restart as soon as the DS2482 does not acknowledge the command code.

1-Wire Single Bit, e. g., to generate a single time slot on a 1-Wire IO channel

Case A: 1-Wire idle (1WB = 0), no busy polling

S AD,0 A 1WSB A <byte> A P (Idle)

S AD,1 A <byte> A\ P

The idle time is needed for the 1-Wire function to complete. Then access the device in read mode to get the result

from the 1-Wire single-bit command.

Case B: 1-Wire idle (1WB = 0), busy polling until the 1-Wire Command is completed.

S AD,0 A 1WSB A <byte> A

Sr AD,1 A <byte> A <byte> A\ P

When 1WB has changed from 1 to 0, the Status Register holds the valid result of the 1-Wire Single Bit command.

Case C: 1-Wire busy (1WB = 1)

S AD,0 A 1WSB A\ P

The master should stop and restart as soon as the DS2482 does not acknowledge the command code.

1-Wire Triplet, e.g., to perform a Search ROM function on a 1-Wire IO channel

Case A: 1-Wire idle (1WB = 0), no busy polling

S AD,0 A 1WT A <byte> A P (Idle)

S AD,1 A <byte> A\ P

The idle time is needed for the 1-Wire function to complete. Then access the device in read mode to get the result

from the 1-Wire Triplet command.

Case B: 1-Wire idle (1WB = 0), busy polling until the 1-Wire Command is completed.

S AD,0 A 1WT A <byte> A

Sr AD,1 A <byte> A <byte> A\ P

When 1WB has changed from 1 to 0, the Status Register holds the valid result of the 1-Wire Triplet command.

Repeat until the 1WB

bit has changed to 0

Repeat until the 1WB

bit has changed to 0

Repeat until the 1WB

bit has changed to 0

1 2 ... 15 16 17 18 19 20 21 22

Sem comentários

Rainbow-electronics DS2482-800 Manual do Utilizador Página 20