MCP9902 datasheet(17/50 Pages) MICROCHIP

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DS20005382C-page 17

MCP9902/3/4

5.4.1

WRITE BYTE

The Write Byte is used to write one byte of data to the

registers, as shown in Table 5-2.

5.4.2

READ BYTE

The Read Byte protocol is used to read one byte of

data from the registers as shown in Table 5-3.

5.4.3

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 Table 5-4.

5.4.4

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

TABLE 5-2:

WRITE BYTE PROTOCOL

START

Slave Address

ACK

Address

ACK

Data

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 5-3:

READ BYTE PROTOCOL

START

Slave Address

ACK

1 → 0

YYYY_YYY

XXh

START

Slave Address

ACK

NACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 5-4:

SEND BYTE PROTOCOL

START

Slave Address

ACK

Address

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 5-5:

RECEIVE BYTE PROTOCOL

START

Slave Address

ACK

NACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

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