L99UDL01 datasheet(46/88 Pages) STMICROELECTRONICS

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Serial communications

L99UDL01

46/88

DS12511 Rev 5

5.9

Data-In payload

The Payload (Data Byte 1 and Data byte 2) is the data transferred to the L99UDL01 with

every SPI communication. The Payload always follows the OpCode and the Address bits.

For write accesses, the Payload represents the new data written to the addresses registers.

For Read & Clear operations the Payload indicates which bits to clear in the Status Register.

For every payload bit set to a “1” the corresponding Status bit is cleared.

For a Read Operation the Payload bits are not used. For functional safety reasons it is

recommended to set the unused Payload bits to ‘0’.

5.10

SDO frame

The Data-Out Frame consist of a Frame length 24 bits (GSB+Data1+Data2). The first eight

transmitted bits contain device related status information and are latched into the shift

the Global Status Byte (GSB) and are transmitted at every SPI transaction.

Figure 15. SDO frame

The subsequent bytes contain the payload data and are latched into the shift register with

every eighth positive SCK edge. This could lead to an inconsistency of data between the

GSB and Payload due to different shift register load times. It should be noted that no

Table 20. Status registers addresses

Status registers

RAM ADDR

RWC

18H

Status register 18H

...

13H

Status register 13H

R(1)

1. Just the V3V3UV flag can be cleared

12H

Status register 12H

R/R&C

11H

Status register 11H

R/R&C

10H

Status register 10H

R/R&C

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