Pni RM3000 Sensor Suites Manual de usuario descargar pdf (Pagina 37)

RM3000 & RM2000 Sensor Suite User Manual r08 Page 37 of 41

6.1.1 Legacy Operation SPI Activity Sequence

The SPI activity sequence is given below for Legacy operation. SPI timing is discussed

in Section 4.4. The Return Byte is 9B

. Two (2) data bytes will be clocked out for a

Legacy measurement. The Command Byte is discussed below.

Figure 6-1: SPI Activity Sequence Diagram for Legacy Operation

6.1.2 Legacy Command Byte

The command byte to initiate a sensor measurement is defined as follows:

Bit #

Value

PS2

PS1

PS0

AS1

AS0

PS0-PS2: Period Select

Selects the number of sensor circuit oscillation cycles (cycle counts) to be counted

while simultaneously using the internal fixed reference clock to measure the time to

obtain this count.

1 2 ... 32 33 34 35 36 37 38 39 40 41

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Pni RM3000 Sensor Suites Manual de usuario Pagina 37