PAC1941T-1ESLASH4MX. datasheet(37/96 Pages) MICROCHIP

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DS20006543A-page 37

PAC194X

Figure 6-2 shows how the auto-incrementing read loop

works with the SKIP option on and off. It also shows

how the write loop works with the REFRESH,

REFRESH_V and REFRESH_G commands.

6.6

I2C/SMBus Commands

6.6.1

REFRESH AND REFRESH_V

REFRESH and REFRESH_V commands are sent

using the Send Byte command, the client address and

the desired command (00h for REFRESH or 1Fh for

REFRESH_V). See Table 6-3.

6.6.2

GENERAL CALL ADDRESS

RESPONSE

When the host sends the General Call address, the

PAC194X is able to execute the REFRESH command

by means of a second version of the REFRESH

command called REFRESH_G (see Register 7-12).

Just as the REFRESH command is sent using a Send

Byte command with the client address and the

REFRESH command (00h), the REFRESH_G com-

mand is sent using Send Byte with the General Call

address (0000 000) and the REFRESH_G command

(1Eh).

Table 6-4 shows the response to the General Call

command for REFRESH_G.

6.6.3

WRITE BYTE

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

registers, as shown in Table 6-5.

6.6.4

READ BYTE

The Read Byte protocol is used to read one byte of

data from the registers, as shown in Table 6-6.

If an invalid register address is specified, the client will

ACK its address but NACK the register address.

The host will NACK (not acknowledge) the data

received from the client by holding the SMBus data

line high after the eighth data bit is sent.

TABLE 6-3:

REFRESH AND REFRESH_V COMMANDS

START

Client Address

ACK

REFRESH or

REFRESH_V

Command

ACK

STOP

1 → 0

YYYY_YYY

00h or 1Fh

0 → 1

TABLE 6-4:

GENERAL CALL RESPONSE

START

General Call

Address

ACK

REFRESH_G

Command

ACK

STOP

1 → 0

0000_000

1Eh

0 → 1

TABLE 6-5:

WRITE BYTE PROTOCOL

START

Client

Address

ACK

Address

ACK

STOP

1 → 0

YYYY_YYY

XXh

0 → 1

TABLE 6-6:

READ BYTE PROTOCOL

START

Client

Address

WR ACK

Address

ACK START

Client

Address

RD ACK

Data

NACK STOP

1 → 0 YYYY_YYY

XXh

1 → 0

YYYY_YYY

XXh

0 → 1

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