Atmel Xplained Pro Evaluation Kit ATSAMD20-XPRO ATSAMD20-XPRO Data Sheet
Product codes
ATSAMD20-XPRO
374
Atmel | SMART SAM D20 [DATASHEET]
Atmel-42129K–SAM-D20_datasheet–06/2014
0: The data is sampled on a leading SCK edge and changed on a trailing SCK edge.
1: The data is sampled on a trailing SCK edge and changed on a leading SCK edge.
This bit is not synchronized.
Table 25-3. SPI Transfer Modes
z
Bits 27:24 – FORM[3:0]: Frame Format
shows the various frame formats supported by the SPI. When a frame format with address is selected,
the first byte received is checked against the ADDR register.
Table 25-4. Frame Format
z
Bits 23:22 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
z
Bits 21:20 – DIPO[1:0]: Data In Pinout
These bits define the data in (DI) pad configurations.
These bits define the data in (DI) pad configurations.
In master operation, DI is MISO.
In slave operation, DI is MOSI.
These bits are not synchronized.
Table 25-5. Data In Pinout
z
Bits 19:18 – Reserved
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
These bits are unused and reserved for future use. For compatibility with future devices, always write these bits to
zero when this register is written. These bits will always return zero when read.
Mode
CPOL
CPHA
Leading Edge
Trailing Edge
0x0
0
0
Rising, sample
Falling, change
0x1
0
1
Rising, change
Falling, sample
0x2
1
0
Falling, sample
Rising, change
0x3
1
1
Falling, change
Rising, sample
FORM[3:0]
Name
Description
0x0
SPI
SPI frame
0x1
-
Reserved
0x2
SPI_ADDR
SPI frame with address
0x3-0xF
-
Reserved
DIPO[1:0]
Name
Description
0x0
PAD[0]
SERCOM PAD[0] is used as data input
0x1
PAD[1]
SERCOM PAD[1] is used as data input
0x2
PAD[2]
SERCOM PAD[2] is used as data input
0x3
PAD[3]
SERCOM PAD[3] is used as data input