UCS2113 datasheet(30/62 Pages) MICROCHIP

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UCS2113

DS20005680B-page 30

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7.9

SMBus Write Byte

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

specific register as shown in Table 7-2.

7.10

SMBus Read Byte

The Read Byte protocol is used to read one byte of

data from the registers as shown in Table 7-3.

7.11

Block Write

The Block Write is used to write multiple data bytes to

a group of contiguous registers, as shown in Table 7-4.

It is an extension of the Write Byte Protocol.

7.12

Block Read

The Block Read is used to read multiple data bytes

from a group of contiguous registers, as shown in

Table 7-5. It is an extension of the Read Byte Protocol.

TABLE 7-2:

WRITE BYTE PROTOCOL

START

Client

Address

ACK

Reg. Addr.

ACK Register Data

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 7-3:

READ BYTE PROTOCOL

START

Client Address

ACK

1→0

YYYY_YYY

XXh

START

Client Address

ACK

NACK

STOP

1 →0

YYYY_YYY

XXh

0 → 1

Note:

The Block Write and Block Read protocols

require that the address pointer be auto-

matically incremented. For a write com-

mand, the address pointer will be

automatically incremented when the ACK

is sent to the host. There are no over or

under bound limit checking and the

address pointer will wrap around from FFh

to 00h if necessary

TABLE 7-4:

BLOCK WRITE PROTOCOL

START

Client Address

ACK

Address

ACK

Repeat N Times

STOP

ACK

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 7-5:

BLOCK READ PROTOCOL

START

Client Address

ACK

Address

ACK

1→0

YYYY_YYY

XXh

START

Client Address

ACK

Repeat N Times

STOP

ACK

1→0

YYYY_YYY

XXh

0 → 1

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