Information

SPIx_CTARn_SLAVE field descriptions (continued)
Field Description
Selects the inactive state of the Serial Communications Clock (SCK).
0 The inactive state value of SCK is low.
1 The inactive state value of SCK is high.
25
CPHA
Clock Phase
Selects which edge of SCK causes data to change and which edge causes data to be captured. This bit is
used in both master and slave mode. For successful communication between serial devices, the devices
must have identical clock phase settings. In Continuous SCK mode, the bit value is ignored and the
transfers are done as the CPHA bit is set to 1.
0 Data is captured on the leading edge of SCK and changed on the following edge.
1 Data is changed on the leading edge of SCK and captured on the following edge.
24–23
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
22
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
21–0
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
Chapter 46 Serial Peripheral Interface (SPI)
K20 Sub-Family Reference Manual, Rev. 1.1, Dec 2012
Freescale Semiconductor, Inc.
Preliminary
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