L9963E datasheet(35/184 Pages) STMICROELECTRONICS

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4.2.4.3

Broadcast access

The Broadcast access allows sending a WRITE command over the communication bus to all the L9963E units.

Broadcast READ is not supported.

The broadcast write is followed by an echo frame generated by the L9963E Master unit. This is necessary in

order to avoid multiple devices accessing the communication bus simultaneously, in order to generate a conflict

error.

Table 27. SPI protocol: broadcast access frame

Dev ID = 0000

Address

DATA WRITE

CRC

Special Answer

(0000)

Address ECHO

DATA WRITE ECHO

CRC

L9963E Master unit will answer to a broadcast READ command with the following frame:

Table 28. SPI protocol: broadcast read answer frame

Dev ID = 0000

Address

DATA WRITE

CRC

Special Answer

(0000)

Address ECHO

0x0

CRC

Table 29. Broadcast access frame field description:

Field

Length

Value

Description

P.A.

1 bit

Command sent by Master unit (MOSI)

R/W

1 bit

Write

Dev ID

5 bit

0x0

The 0x0 address identifies broadcast commands

Address

7 bit

From 0x00 to 0x5F

Identifies the y-th register of the device

Address ECHO

GSW

2 bit

0b00

Refer to Section 4.2.4.5 Global Status Word (GSW)

CRC

6 bit

From 0x00 to 0x3F

CRC calculated on the [39-7] field of the frame. Refer to

Section 4.2.4.6 CRC calculation

DATA WRITE

18 bit

Depends on the

Data to be written in the y-th register of the x-th device

DATA WRITE

ECHO

Special Answer

5 bit

0x0

Identifies the ECHO frame issued in a broadcast write protocol

L9963E

Serial communication interface

DS13636 - Rev 12

page 35/184

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