EMC1812 datasheet(33/102 Pages) MICROCHIP

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6.7.3

SMBus Read Byte

The Read Byte protocol is used to read one byte of data from the registers, as shown below.

Table 6-4. Read Byte Protocol

START

Slave Address

WRITE

ACK

1 → 0

YYYY_YYY

XXh

START

Slave Address

READ

ACK

NACK

STOP

1 → 0

0101_000

XXh

0 → 1

6.7.4

Block Read

The Block Read is used to read multiple data bytes from a group of contiguous registers, as shown

below. It is an extension of the Read Byte protocol.

Note: When using the Block Read protocol, the internal Address Pointer will be automatically

incremented after every data byte is received. It will wrap from FFh to 00h.

Table 6-5. Block Read Protocol

START

Slave Address

Write

ACK

Address

ACK

1->0

YYYY_YYY

XXh

START

Slave Address

Read

ACK

Data

ACK

NACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

Note: The Block Write and Block Read protocols require that the Address Pointer be automatically

incremented. For a read command, the Address Pointer will be automatically incremented when the ACK

is sent by the host. There is no over or under bound limit checking and the Address Pointer will wrap

around from FFh to 00h if necessary.

6.7.5

SMBus Send Byte

The Send Byte protocol is used to set the internal Address Register Pointer to the correct address

location. No data is transferred during the Send Byte protocol, as shown below.

Table 6-6. Send Byte Protocol

START

Slave Address

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

6.7.6

SMBus Receive Byte

The Receive Byte protocol is used to read data from a register when the internal register Address Pointer

is known to be at the right location (e.g., set via Send Byte). This is used for consecutive reads of the

same register as shown in Table 6-7.

Multi-Channel Low-Voltage Remote Di...

System Management Bus Protocol

Datasheet

DS20005751A-page 33

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