C o m m a n d i n t e r f a c e

I 2 C M A S T E R / S L A V E I N T E R F A C E

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I2C command interface. .

I 2 C c o m m a n d i n t e r f a c e

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Locked interrupt driven mode

Master module and slave module commands

The I2C module converts parallel (8-bit) data to serial data and serial data to parallel data between the processor and the I2C bus, using a set of interface registers.

•The primary interface register for transmitting data is the CMD_TX_DATA_REG (write-only).

•The primary interface register for receiving data is the STATUS_RX_DATA_REG (read-only).

I2C operates in a locked interrupt driven mode, which means that each command issued must wait for an interrupt response before the next command can be issued (illustrated in "Flow charts," beginning on page 457).

The first bit of the command — 0 or 1 — indicates to which module — master or slave, respectively — the command in the CMD field (of the CMD_TX_DATA_REG) is sent. The master module can be sent a master command only; the slave module can be sent a slave command only (see "Master module and slave module commands," beginning on page 449, for a list of commands). If a command is sent to the master module, that module is locked until a command acknowledgement is given. Similarly, if a command is sent to the slave module, the slave module is locked until it receives a command acknowledgement. With either module, the acknowledgement can be any interrupt associated with that module. When a module is locked, another command must not be sent to that module.

The command lock status can be checked in the STATUS_RX_DATA_REG.

The I2C master recognizes four high-level commands, which are used in the CMD field of the Command register; the I2C slave recognizes two high-level commands:

Command	Name	Description

0x0	M_NOP	No operation.

0x4	M_READ	Start reading bytes from slave.

0x5	M_WRITE	Start writing bytes to slave.

0x6	M_STOP	Stop this transaction (give up the I2C bus).
0x10	S_NOP	No operation. This command is necessary for 16-bit
		mode, providing data in TX_DATA_REG without a
		command.

0x16	S_STOP	Stop transaction by not acknowledging the byte
		received.

Bus arbitration Any M_READ or M_WRITE command causes the I2C module to participate in the bus arbitration process when the I2C bus is free (idle). If the module becomes the new

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449

NS9215 specifications

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Digi NS9215 manual C o m m a n d i n t e r f a c e, Command Name Description

Models: NS9215

I 2 C c o m m a n d i n t e r f a c e

Command

Name

Description

S_NOP

NS9215 specifications