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Figure 59-12. Crystal Circuit With Internal, External and Parasitic Capacitance
XOUT
Internal
C
EL1
C
L1
C
L2
C
P1
C
P2
C
EL2
External
XIN
Using this model the total capacitive load for the crystal can be calculated as shown in the equation
below:
tot
=
1
+
1
+
EL1
2
+
2
+
EL2
1
+
1
+
EL1
+
2
+
2
+
EL2
where C
tot
is the total load capacitance seen by the crystal. This value should be equal to the load
capacitance value found in the crystal manufacturer datasheet.
The parasitic capacitance C
ELn
can in most applications be disregarded as these are usually very small. If
accounted for, these values are dependent on the PCB material and PCB layout.
For some crystal the internal capacitive load provided by the device itself can be enough. To calculate the
total load capacitance in this case. C
ELn
and C
Pn
are both zero, C
L1
= C
L2
= C
L
, and the equation reduces
to the following:
tot
=
2
See the related links for equivalent internal pin capacitance values.
59.7 Programming and Debug Ports
For programming and/or debugging the SAM D5x/E5x, the device should be connected using the Serial
Wire Debug, SWD, interface. Currently the SWD interface is supported by several Microchip and third
party programmers and debuggers, like the Atmel-ICE, SAM-ICE or SAM D5x/E5x Xplained Pro (SAM
D5x/E5x evaluation kit) Embedded Debugger.
Refer to the Atmel-ICE, SAM-ICE or SAM D5x/E5x Xplained Pro user guides for details on debugging
and programming connections and options. For connecting to any other programming or debugging tool,
refer to that specific programmer or debugger’s user guide.
The SAM D5x/E5x Xplained Pro evaluation board supports programming and debugging through the
onboard embedded debugger so no external programmer or debugger is needed.
SAM D5x/E5x Family Data Sheet
Schematic Checklist
© 2019 Microchip Technology Inc.
Datasheet
DS60001507E-page 2105