TLC6989DYYR datasheet(30/71 Pages) TI2

30 / 71 page

DATA_RD (Data Read command)

Return to the SPI Command Table

The DATA_RD command is used to read data words from the RXFIFO. Even when the received CRC does not

match with the calculated CRC over the command word, the device returns the requested number of data words

and the CRC calculated over the data words. When the received CRC does not match the calculated CRC over

the command word, the FAULT pin is pulled low (when not masked) and the flag FLAG_SPI_CRC is set. An

example of DATA_RD command requesting 3 data words is depicted in Figure 7-17.

SDI

SDO

SOUT

0x9002

CRC0

CRC1

Data0

Data1

Data2

Figure 7-17. Example of DATA_RD command

REG_WR_CRC (Register Write CRC command)

Return to the SPI Command Table

The REG_WR_CRC command is used to write the internal registers of the TLC6989 device. The command

includes a field to indicate the address of the first register to be written. All the data words received by the SPI

peripheral are stored in shadow registers. Only when the received CRC matches with the calculated CRC over

the command word and data words, the registers are updated. This command returns the STATUS register and

the CRC calculated over the STATUS register. An example of REG_WR_CRC command writing 3 registers is

depicted in Figure 7-18.

SDI

SDO

SOUT

0xA082

CCSICTRL

TXFFLVL

CRC0

STATUS

CRC1

RXFFLVL

Figure 7-18. Example of REG_WR_CRC command

TLC6989

SLVSHF5 – NOVEMBER 2024

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TLC6989DYYR Datasheet(PDF) 30 Page - Texas Instruments