Op
Code
Register
Address
#
Words
Data
8 bits
16 bits
8 bits
32 bits
SPI Header
Data
AHB_xx_BURST_START
AHB_xx_BURST_READ/WRITE
AHB_xx_BURST_END
CS
Data
32 bits
Data
AHB_xx_BURST_READ/WRITE
Firmware
21
SLLU216 – July 2019
Copyright © 2019, Texas Instruments Incorporated
SPI to CAN FD SBC + LIN Transceiver BoosterPack User's Guide
Figure 13. Multi-word SPI packet example
shows a 2 word SPI transfer example, and how the READ/WRITE function is called twice to do
each individual word transfer. This is helpful for cutting down on the SPI overhead when transferring a
CAN message to or from the TCAN4550-Q1, and minimize the maximum SPI frequency required.
