The Embedded Debugger features an Atmel Data Gateway Interface
(DGI) by using either a SPI or I²C port. The DGI can be used to send a variety of data from
the SAM D20 to the host PC. For further information on how to use the DGI interface see
Embedded Debugger.
Table 1. DGI Interface Connections
When Using SPI| Pin on SAM D20 |
Function |
|---|
| PB31 |
SERCOM5 PAD[1] SPI SS (Slave select) (SAM D20 is Master) |
| PB16 |
SERCOM5 PAD[0] SPI MISO (Master In, Slave Out) |
| PB22 |
SERCOM5 PAD[2] SPI MOSI (Master Out, Slave in) |
| PB23 |
SERCOM5 PAD[3] SPI SCK (Clock Out) |
Table 2. DGI Interface Connections
When Using I²C| Pin on SAM D20 |
Function |
|---|
| PA08 |
SERCOM2 PAD[0] SDA (Data line) |
| PA09 |
SERCOM2 PAD[1] SCL (Clock line) |
Four GPIO lines are connected to the Embedded Debugger. The EDBG
can monitor these lines and time stamp pin value changes. This makes it possible to
accurately time stamp events in the SAM D20 application code. For further information on
how to configure and use the GPIO monitoring features see Embedded Debugger.
Table 3. GPIO Lines Connected To
the EDBG| Pin on SAM D20 |
Function |
|---|
| PA27 |
GPIO0 |
| PA28 |
GPIO1 |
| PA20 |
GPIO2 |
| PA21 |
GPIO3 |