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Chapter 9
Interrupt Controller
This chapter describes the interrupt controller and all of the signals associated with it. The interrupt
controller of the MC68VZ328 supports all internal interrupts as well as external edge- and level-sensitive
interrupts. There are seven interrupt levels. Level 7 has the highest priority and level 1 has the lowest.
Interrupts can originate from the following sources:
•
EMUIRQ or hardware breakpoint interrupt (level 7)
•
IRQ6 external interrupt (level 6)
•
Timer unit 1 (level 6)
•
Timer unit 2 (configurable from level 1 to 6)
•
Pulse-width modulator unit 1 (level 6)
•
Pulse-width modulator unit 2 (configurable from level 1 to 6)
•
IRQ5 external interrupt—pen (level 5)
•
Serial peripheral interface unit 1 (configurable from level 1 to 6)
•
Serial peripheral interface unit 2 (level 4)
•
UART unit 1 (level 4)
•
UART unit 2 (configurable from level 1 to 6)
•
Software watchdog timer interrupt (level 4)
•
Real-time clock (level 4)
•
Real-time interrupt (level 4)
•
Keyboard interrupt (level 4)
•
General-purpose interrupt INT[3:0] (level 4)—these pins can be used as keyboard interrupts
•
IRQ3 external interrupt (level 3)
•
IRQ2 external interrupt (level 2)
•
IRQ1 external interrupt (level 1)
Interrupt Controller
9-1
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