TC1796
System Units (Vol. 1 of 2)
Interrupt System
User’s Manual 14-3 V2.0, 2007-07
Interrupt, V2.0
14.2 Service Request Nodes
In total, there are 181 Service Request Nodes available in the TC1796. Each SRN
contains a Service Request Control Register and interface logic that connects it to the
triggering unit and to the two interrupt arbitration buses. Some peripheral units of the
TC1796 have multiple SRNs.
14.2.1 Service Request Control Registers
All Service Request Control Registers in the TC1796 have the same format. In general,
these registers contain:
• Enable/disable information
• Priority information
• Service provider destination
• Service request status bit
• Software-initiated service request set and clear bits
Besides being activated by the associated triggering unit through hardware, each SRN
can also be set or cleared by software via two software-initiated service request control
bits.
Note: The description given in this chapter characterizes all Service Request Control
Registers of the TC1796. Further Information on peripheral module interrupt
functions such as enable or request flags is provided in the corresponding
sections of the module chapters.
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