TC1784
Fast Analog to Digital Converter (FADC)
User´s Manual
24-8
V1.1, 2011-05
FADC, V2.21
24.2.4
Channel Triggers
As shown
, the trigger behavior of an FADC channel x is determined by its
channel x trigger control logic. An FADC channel x can be triggered by three trigger
sources:
•
External trigger source input signal, selectable from an input vector TS[H:A]
•
Internal channel x timer trigger signal
•
Internal neighbor channel trigger signal
If one of these trigger sources is selected, becomes active, and the gating logic is
programmed to enable trigger signals (signal ECHTIMx set), the conversion request flag
CRFx becomes set indicating a valid request for FADC channel x.
The gating source input and gating mode selection logic generate an enable signal for
channel x timer that determines whether any of the three conversion trigger signal
sources is allowed to set the channel x conversion request flag CRFx. It can select an
input signal from the input vector GS[H:A].
The control logic does the following tasks, independently in each of the FADC channels:
•
Gating source input selection (CFGRx.GSEL)
•
Gating mode selection (CFGRx.GM)
•
Trigger source input selection (CFGRx.TSEL)
•
Trigger mode selection (CFGRx.TM)
•
Channel timer request generation
•
Conversion request flag set/clear
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