User manual

Table 6-8 below describes the function of the option links associated with Clock configuration. The default configuration is indicated by
BOLD & Red text.
Option Link Settings
Reference Function Fitted Alternative (Removed) Related To
R1 20MHz Main Clock
Oscillator
Parallel resistor for on-board
main clock X1.
Not fitted
-
R2 20MHz Main Clock
Oscillator
X1 is used for XIN
External clock source is used
for XIN
R3, R4, R5
R3 20MHz Main Clock
Oscillator
X1 is used for XOUT
External clock source is used
for XOUT
R2, R4, R5
R4 20MHz Main Clock
Oscillator
Routes XIN CPU pin to J1
header
XIN CPU pin and J1 header
are not connected
R2, R3, R5
R5 20MHz Main Clock
Oscillator
Routes XOUT CPU pin to J1
and JA2 headers
(External clock source is used
for XOUT)
XOUT CPU pin and J1 and
JA2 headers are not
connected
R2, R3, R4
R6 32.768kHz Sub Clock
Oscillator
Parallel resistor for on-board
sub clock X2.
Not fitted
-
R7 32.768kHz Sub Clock
Oscillator
X2 is used for XCIN
X2 is disconnected for XCIN R8, R9, R10
R8 32.768kHz Sub Clock
Oscillator
X2 is used for XCOUT
X2 is disconnected for XCOUT R7, R9, R10
R9 32.768kHz Sub Clock
Oscillator
Routes XCIN CPU pin to J1
header
XCIN CPU pin and J1 header
are not connected
R7, R8, R10
R10 32.768kHz Sub Clock
Oscillator
Routes XCOUT CPU pin to J1
header
XCOUT CPU pin and J1
header are not connected
R7, R8, R9
Table 6-8: Clock Configuration Links
11