L9963E datasheet(27/184 Pages) STMICROELECTRONICS

tên linh kiện	L9963E

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4.2.4

SPI protocol details

The protocol is out-of-frame in order to manage the propagation delay of the commands sent by MCU and the

answers generated by the L9963E stacked in the vertical interface. A command sent at the N-th frame will receive

its feedback at the (N+1)th frame.

Figure 11. Out of frame protocol description

MCU can access the devices in different ways.

4.2.4.1

Single access

The single access behavior is based on a Write and Read approach.

The execution of each WRITE command sent by MCU can be immediately verified by interpreting the answer

incoming from the addressed device. Any reply is buffered into L9963E Master unit, which passes it to the MCU

on its next command.

Figure 12. Write and read access

Table 19. SPI protocol: single access addressed frame (write and read)

Dev ID

Address

DATA WRITE

CRC

Dev ID

Address feedback

DATA READ

CRC

READ commands require the same inter-frame time as the WRITE ones. Any reply is buffered into L9963E

Master unit, which passes it to the MCU on its next command.

L9963E

Serial communication interface

DS13636 - Rev 12

page 27/184

L9963E bảng dữ liệu(PDF) 27 Page - STMicroelectronics