13

Atmel SAM D20 [DATASHEET Summary]

42129JS–SAM–12/2013

2.

Only some pins can be used in SERCOM I

details on the I

3.

Note that TC6 and TC7 are not supported on the SAM D20G. Refer to “Configuration Summary” on page 3 for details.

4.

This function is only activated in the presence of a debugger

5.2

Other Functions

5.2.1

Oscillator Pinout

The oscillators are not mapped to the normal PORT functions and their multiplexing are controlled by registers in the

System Controller (SYSCTRL). Refer to !!!CRs_SYSCTRL_Top!!! for more information.

5.2.2

Serial Wire Debug Interface Pinout

After reset, SWCLK functionality is selected for pin PA30 to allow for debugger probe detection. The application software

can switch the SWCLK functionality of PA30 to GPIO (or other peripherals) during runtime. PA31, by default, is config-

ured like other normal I/O pins and will automatically switch to SWDIO function when a debugger cold-plugging or hot-

plugging is detected. When the device is put in debug mode, application software accesses to PA30 and PA31 PORT

registers are ignored.

Refer to !!!CRs_DSU_Top!!! for more information.

Oscillator

Supply

Signal

I/O Pin

XOSC

VDDIO

XIN

PA14

XOUT

PA15

XOSC32K

VDDANA

XIN32

PA00

XOUT32

PA01

Signal

Supply

I/O Pin

SWCLK

VDDIO

PA30

SWDIO

VDDIO

PA31