Infineon Technologies TC1784, User Manual

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TC1784
System Control Unit (SCU)
User´s Manual 3-85 V1.1, 2011-05
32-bit SCU, V1.18
3.3.2 External Request Unit (ERU)
The External Request Unit (ERU) is a versatile event and pattern detection unit. Its major
task is the
generation of interrupts based on selectable trigger events at different
inputs , e.g. to generate external interrupt requests if an edge occurs at an input pin.
The detected events can also be used by other modules to trigger or to gate module-
specific actions.
3.3.2.1 Introduction
The ERU of the TC1784 can be split in three main functional parts:
•
4 independent Input Channels x for input selection and conditioning of trigger or
gating functions
• Event distribution: A Connecting Matrix defines the events of the Input Channel x
that lead to a reaction of an Output Channel y.
• 4 independent Output Channels y for combination of events, definition of their
effects and distribution to the system (interrupt generation, ...)
Figure 3-20 External Request Unit Overview
These tasks are handled by the following building blocks:
•
An External Request Select Unit (ERSx) per Input Channel allows the selection of
one input vector out of the 4 possible inputs available.
• An Event Trigger Logic (ETLx) per Input Channel allows the definition of the
transition (edge selection, or by software) that lead to a trigger event and can also
store this status. Here, the input levels of the selected signals are translated into
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External Request
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External Trigger
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Output Gating
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Output
Channel 0
Output
Channel 1
Output
Channel 3
Output
Channel 2
External Request Unit (ERU)
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Input Channel 1
Input Channel 2
Input Channel 3
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