Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
482
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
z
Bit 17:16 – DOPO: Data Out Pinout
This bit defines the available pad configurations for data out (DO) and the serial clock (SCK). In slave operation,
the slave select line (_SS) is controlled by DOPO, while in master operation the _SS line is controlled by the port
configuration.
In master operation, DO is MOSI.
In slave operation, DO is MISO.
These bits are not synchronized.
This bit defines the available pad configurations for data out (DO) and the serial clock (SCK). In slave operation,
the slave select line (_SS) is controlled by DOPO, while in master operation the _SS line is controlled by the port
configuration.
In master operation, DO is MOSI.
In slave operation, DO is MISO.
These bits are not synchronized.
Table 26-7. Data Out Pinout
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Bits 15:9 – 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
Bit 8 – IBON: Immediate Buffer Overflow Notification
This bit controls when the buffer overflow status bit (STATUS.BUFOVF) is asserted when a buffer overflow occurs.
0: STATUS.BUFOVF is asserted when it occurs in the data stream.
1: STATUS.BUFOVF is asserted immediately upon buffer overflow.
This bit is not synchronized.
This bit controls when the buffer overflow status bit (STATUS.BUFOVF) is asserted when a buffer overflow occurs.
0: STATUS.BUFOVF is asserted when it occurs in the data stream.
1: STATUS.BUFOVF is asserted immediately upon buffer overflow.
This bit is not synchronized.
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Bit 7 – RUNSTDBY: Run In Standby
This bit defines the functionality in standby sleep mode.
These bits are not synchronized.
This bit defines the functionality in standby sleep mode.
These bits are not synchronized.
Table 26-8. Run In Standby Configuration
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Bits 6:5 – 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 4:2 – MODE: Operating Mode
These bits must be written to 0x2 or 0x3 to select the SPI serial communication interface of the SERCOM.
0x2: SPI slave operation
0x3: SPI master operation
These bits are not synchronized.
These bits must be written to 0x2 or 0x3 to select the SPI serial communication interface of the SERCOM.
0x2: SPI slave operation
0x3: SPI master operation
These bits are not synchronized.
z
Bit 1 – ENABLE: Enable
0: The peripheral is disabled or being disabled.
0: The peripheral is disabled or being disabled.
DOPO
DO
SCK
Slave_SS
Master_SS
0x0
PAD[0]
PAD[1]
PAD[2]
System configuration
0x1
PAD[2]
PAD[3]
PAD[1]
System configuration
0x2
PAD[3]
PAD[1]
PAD[2]
System configuration
0x3
PAD[0]
PAD[3]
PAD[1]
System configuration
RUNSTDBY
Slave
Master
0x0
Disabled. All reception is dropped,
including the ongoing transaction.
including the ongoing transaction.
Generic clock is disabled when ongoing transaction is
finished. All interrupts can wake up the device.
finished. All interrupts can wake up the device.
0x1
Wake on Receive Complete interrupt.
Generic clock is enabled while in sleep modes. All
interrupts can wake up the device.
interrupts can wake up the device.