EMC1412 datasheet(17/46 Pages) MICROCHIP

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EMC1412

DS20005273B-page 17

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5.10.2

READ BYTE

The Read Byte protocol is used to read one byte of data

from the registers as shown in the table below.

5.10.3

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 in the table below.

5.10.4

RECEIVE BYTE

The Receive Byte protocol is used to read data from a

known to be at the right location (e.g. set via Send

Byte). This is used for consecutive reads of the same

5.11

Alert Response Address

The ALERT output can be used as a processor inter-

rupt or as an SMBus Alert.

When it detects that the ALERT pin is asserted, the

host will send the Alert Response Address (ARA) to the

general address of 0001_100xb. All devices with active

interrupts will respond with their client address as

shown in the table below.

TABLE 5-3:

WRITE BYTE PROTOCOL

START

Slave Address

ACK

Address

ACK

Data

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 5-4:

READ BYTE PROTOCOL

START

Slave

Address

WR ACK

Address

ACK

START

Slave

Address

RD ACK

Data

NACK STOP

1 → 0 YYYY_YYY

XXh

1 → 0

YYYY_YYY

0 → 1

TABLE 5-5:

SEND BYTE PROTOCOL

START

Slave Address

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 →1

TABLE 5-6:

RECEIVE BYTE PROTOCOL

START

Slave Address

ACK

NACK

STOP

1 →0

YYYY_YYY

XXh

0 → 1

TABLE 5-7:

ALERT RESPONSE ADDRESS PROTOCOL

START

Alert Response Address

ACK

Device Address

NACK

STOP

1 → 0

0001_100

YYYY_YYY

0 → 1

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