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TC1784
Interrupt System
User´s Manual
13-1
V1.1, 2011-05
Interrupt, V1.4
13
Interrupt System
The TC1784 interrupt system provides a flexible and time-efficient means of processing
interrupts. This chapter describes the interrupt system for the TC1784. Topics covered
include the architecture of the interrupt system, interrupt system configuration, and the
interrupt operations of the TC1784 peripherals and Central Processing Unit (CPU).
General information is also given about the Peripheral Control Processor (PCP).
13.1
Overview
An interrupt request can be serviced either by the CPU or by the PCP. Interrupt requests
are called “service requests” rather than “interrupt requests” in this document because
they can be serviced by either one of the service providers.
Each peripheral in the TC1784 can generate service requests. Additionally, the Bus
Control Units, the Debug Unit, the PCP, and even the CPU itself can generate service
requests to either of the two service providers.
As shown in
, each TC1784 unit that can generate service requests is
connected to one or more Service Request Nodes (SRNs). Each SRN contains a
Service Request Control Register mod_SRCx, where “mod” is the identifier of the
service requesting unit and “x” an optional index. Two arbitration buses connect the
SRNs with two Interrupt Control Units (ICUs), which handle interrupt arbitration among
competing interrupt service requests, as follows:
•
The Interrupt Control Unit (ICU) arbitrates service requests for the CPU and
administers the CPU interrupt arbitration bus.
•
The Peripheral Interrupt Control Unit (PICU) arbitrates service requests for the PCP
and administers the PCP interrupt arbitration bus.
The PCP can make service requests directly to itself (via the PICU), or it can make
service requests to the CPU. The Debug Unit can generate service requests to the PCP
or the CPU. The CPU can make service requests directly to itself (via the ICU), or it can
make service requests to the PCP. The CPU Service Request Nodes are activated
through software.
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