Peripherals - Microchip Technology SAM B11ZR Xplained Pro User Manual

Cortex Debug
Connector pin
5
6
7
8
9
10
Note: The Target reset (CHIP EN pin on the ATSAMB11ZR-210CA module) is isolated from the Cortex
Debug Connector by R300 (0 Ohm link) which is not mounted by default in the PCBA.
4.2

Peripherals

4.2.1 Crystals
The SAM B11ZR Xplained Pro kit contains one mounted 32.768kHz crystal that can be used as a clock
source for the SAM B11ZR. The crystal has cut-straps next to it that can be used to measure the
oscillator safety factor. This is done by cutting the strap and adding a resistor across the strap.
Information about oscillator allowance and safety factors can be found in application note AVR41001.
Table 4-4. External 32.768kHz Crystal
SAM B11ZR pin
RTC_CLKP
RTC_CLKN
4.2.2 Mechanical Buttons
SAM B11ZR Xplained Pro contains two mechanical buttons:
• RESET button connected to the SAM B11ZR reset line
– When the RESET button is pressed it drives the I/O line to ground
• Generic user configurable button
– When the user button is pressed it drives the I/O line to target voltage
Note: There is no pull up resistor connected to the generic user button. Remember to enable the
internal pull up in the SAM B11ZR to use the button.
Table 4-5. Mechanical Buttons
SAM B11ZR pin
CHIP EN
AO_GPIO_0
4.2.3 LED
There is one yellow LED available on the SAM B11ZR Xplained Pro board that can be turned on and off.
The LED can be activated by driving the connected I/O line to GND.
©
2017 Microchip Technology Inc.
Pin / Net
GND
-
-
-
GND
CHIP EN
Function
XIN32
XOUT32
Silkscreen text
RESET
SW0
Function
Ground
-
-
-
Ground
Target reset signal
Shared functionality
-
-
Shared functionality
EDBG SWD
EXT1
User Guide
ATSAMB11ZR
Shared functionality
Reset Button
DS70005334A-page 15