TC1796
Peripheral Units (Vol. 2 of 2)
Controller Area Network (MultiCAN) Controller
User’s Manual 22-210 V2.0, 2007-07
MultiCAN, V2.0
22.9.5 Interrupt Control
The interrupt control logic in the MultiCAN module uses an interrupt compressing
scheme that allows high flexibility in interrupt processing. There are 274 hardware
interrupt sources and one software interrupt source available:
• CAN node interrupts:
– Four different interrupt sources for each of the four CAN nodes = 16 interrupt
sources
• Message object interrupts:
– Two interrupt sources for each message object = 256 interrupt sources
• TTCAN interrupts:
– 3 interrupt sources
• One software initiated interrupt (register MITR)
Each of the 274 hardware initiated interrupt sources is controlled by a 4-bit interrupt
pointer that directs the interrupt source to one of the sixteen interrupt outputs INT_Om
(m = 0-15). This makes it possible to connect more than one interrupt source to one
interrupt output line. The interrupt wiring matrix shown in Figure 22-41 is built up
according to the following rules:
• Each output of the 4-bit interrupt pointer demultiplexer is connected to exactly one
OR-gate input of the INT_Om line. The number “m” of the corresponding selected
INT_Om interrupt output line is defined by the interrupt pointer value.
• Each INT_Om output line has a 147-input OR-gate which is connected to all interrupt
pointer demultiplexer outputs which are selected by an identical 4-bit pointer value.
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