EMC2302 datasheet(23/70 Pages) MICROCHIP

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DS20006532A-page 23

EMC2301/2/3/5

5.11

SMBus Read Byte

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

from the registers as shown in Table 5-5.

5.12

Block Read

The Block Read protocol is used to read multiple data

bytes from a group of contiguous registers as shown in

Table 5-6. It is an extension of the Read Byte Protocol.

5.13

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 in Table 5-7.

5.14

SMBus 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

5.15

Alert Response Address

The ALERT output can be used as a processor inter-

rupt or as an SMBus Alert when configured to operate

as an interrupt. 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 Table 5-9.

The EMC2301/2/3/5 will respond to the ARA in the fol-

lowing way if the ALERT pin is asserted.

Send Client Address and verify that full client

address was sent (i.e. the SMBus communica-

tion from the device was not prematurely

stopped due to a bus contention event).

Set the MASK bit to clear the ALERT pin.

TABLE 5-5:

READ BYTE PROTOCOL

CLIENT

ADDR.

REG.

ADDR.

1 → 0

YYYY_YYY

XXh

CLIENT

ADDR.

REG.

DATA

1 → 0 YYYY_YYYb 10

XXh

10 → 1

Note:

When using the Block Read protocol, the

internal address pointer will be automati-

cally incremented after every data byte is

received. It will wrap from FFh to 00h.

TABLE 5-6:

BLOCK READ PROTOCOL

CLIENT

ADDR.

REG.

ADDR.

1 → 0 YYYY_

YYY

XXh

CLIENT

ADDR.

REG.

DATA

REG.

DATA

1 → 0 YYYY_

YYY

XXh

10 → 1

Note:

The Block Write and Block Read protocols

require that the address pointer be auto-

matically incremented. For a read com-

mand, the address pointer will be

automatically incremented when the ACK

is sent by 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 5-7:

SEND BYTE PROTOCOL

CLIENT

ADDR.

REG.

ADDR.

1 → 0

YYYY_

YYY

XXh

00 → 1

TABLE 5-8:

RECEIVE BYTE PROTOCOL

CLIENT

ADDR.

REG.

DATA

1 → 0

YYYY_

YYY

XXh

10 → 1

TABLE 5-9:

ALERT RESPONSE ADDRESS

PROTOCOL

ALERT

RESPONSE

ADDR.

DEVICE

ADDR.

1 → 0

0001_

100b

YYYY_

YYYb

10 → 1

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