TLC6989 datasheet(31/72 Pages) TI1

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REG_WR (Register Write command)

Return to the SPI Command Table

The REG_WR 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 directly written in registers. This means that the CRC does not impact the writing of registers. 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. This command returns the STATUS register and the CRC

calculated over the STATUS register. An example of REG_WR_CRC command writing 2 registers is depicted in

Figure 7-19.

SDI

SDO

SOUT

0xB041

SPICTRL

CCSICTRL

CRC0

STATUS

CRC1

Figure 7-19. Example of REG_WR command

REG_RD_CRC (Register Read CRC command)

Return to the SPI Command Table

The REG_RD_CRC command is used to read the internal registers of the TLC6989 device. The command

includes a field to indicate the address of the first register to be read. Only when the received CRC matches

with the calculated CRC over the command word, the device returns the requested number of register words and

the CRC calculated over the register words. When the CRC fails, the SDO is kept at logic HIGH. An example of

REG_RD_CRC command reading 1 register is depicted in Figure 7-20.

SDI

SDO

SOUT

0xC000

CRC0

CRC1

DEVID

Figure 7-20. Example of REG_RD_CRC command

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TLC6989

SLVSHF5 – NOVEMBER 2024

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TLC6989 Datasheet(PDF) 31 Page - Texas Instruments