4
SPI Communications
Communication with the device is completed through synchronous serial transfers via SPI. The device is a slave device con-
figured for CPOL = 0, CPHA = 0, MSB first. SPI transfers are completed through a sequence of two phases. During the first
phase, the type of transfer and associated control information is transmitted from the SPI master to the device. Data from the
device is transmitted during the second phase. Any activity on MOSI or SCLK is ignored when CS is negated. Consequently,
intermediate transfers involving other SPI devices may occur between phase one and phase two. Reference Figure 36 .
SCLK
CS
MOSI
Phase One: Command
MISO
Phase One: Response -Previous Command
SCLK
CS
MOSI
Phase Two: Response
T1P1
T2P1
T3P1
T1P2
T2P2
T3P2
MISO
Figure 36. SPI Transfer Detail
MMA65xx
Sensor
Freescale Semiconductor, Inc.
45
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