TC1784
System Control Unit (SCU)
User´s Manual
3-25
V1.1, 2011-05
32-bit SCU, V1.18
3.1.1.6
External Clock Output
Two external clock outputs are provided via pins EXTCLK0 and EXTCLK1. These
external clocks can be enabled/disabled via bits EXTCON.EN0 for EXTCLK0 and
EXTCON.EN1 for EXTCLK1. Each of the clocks that defines a clock domain can
individually be selected to be seen at pins EXTCLK0 or EXTCLK1, this is configured via
bit field EXTCON.SEL0/1. Changing the content of bit field EXTCON.SEL0/1 can lead to
spikes at pins EXTCLK0/1.
Note: Only the burst flash clock of the EBU is not included as the EBU provides a
separate pin here.
Additionally a connection to the GPTA module is implemented to support the start-up
control of an external crystal for the device clock generation. The first time before the
master clock is generated based on a external crystal 1000 cycles of the crystal clock
f
OSC
should be waited before the clock control system is changed to External Crystal
Mode. The 1000 cycles can be counted with the GPTA using
f
OSC
as count input for the
counter.
Programmable Frequency Output for EXTCLK0
This section describes the external clock generation using the Fractional Divider.
Содержание TC1784
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