L9662 datasheet(66/80 Pages) STMICROELECTRONICS

66 / 80 page

Functional description

L9662

66/80

DocID028325 Rev 1

Figure 20. Satellite SPI transfer during normal operation diagram

Based on the above format the micro must send the commands in a specific order. The

following table represents the allowable commands/positions sent out on MOSI along with

responses.

When the device is set to report the MCR in the MISO response it must be done only when

reporting all CCRs. If Data is reported with the MCR in the MISO response then the data

status information is lost. When the MCR is in MISO word 1 then there is no indicator

whether a response in words 2 to 5 are CCR or Data.

If the SR is returned in the MISO response with a CCR then the status information for that

word will not change until the next SR with Data. The SR bits will indicate which words are

CCR and Data.

Table 35. Commands/positions sent out on MOSI along with responses

Word position

Allowable MOSI

Commands MISO reponses

Word (N,1)

MCR

MCR(1) or SR

Only allowed if Words 2-5 are CCRs.

Word (N,2)

CCR1

CCR1 or Data

Word (N,3)

CCR2

CCR2 or Data

Word (N,4)

CCR3

CCR3 or Data

Word (N,5)

CCR4

CCR4 or Data

L9662 Datasheet(PDF) 66 Page - STMicroelectronics