User manual

Atmel SAM4S Xplained Pro [USER GUIDE]

Atmel-42075B-MCU-Atmel SAM4S Xplained Pro-USER GUIDE-03/2013

Pin on SAM4S Function

PB2 UART RXD (SAM4S RX line)

4.3.3 Atmel Data Gateway Interface

The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either a SPI or TWI port.

The DGI can be used to send a variety of data from the SAM4S to the host PC. For further information on how

to use the DGI interface see “Embedded Debugger” on page 6.

Table 4.15. DGI interface connections when using SPI

Pin on SAM4S Function

PA5 Slave select (SAM4S is Master)

PA12 SPI MISO (Master In, Slave Out)

PA13 SPI MOSI (Master Out, Slave in)

PA14 SPI SCK (Clock Out)

Table 4.16. DGI interface connections when using TWI

Pin on SAM4S Function

PA3 SDA (Data line)

PA4 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 SAM4S application

code. For further information on how to configure and use the GPIO monitoring features see “Embedded

Debugger” on page 6.

Table 4.17. GPIO lines connected to the EDBG

Pin on SAM4S Function

PA6 GPIO0

PA22 GPIO1

PA24 GPIO2

PA25 GPIO3