MAC7200 datasheet(368/976 Pages) FREESCALE

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The Interrupt Controller Module (INTC)

MAC7200 Microcontroller Family Reference Manual, Rev. 2

290

Freescale Semiconductor

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If the interrupt vector number returns less than 64 (i.e.-63 or less), this indicates a spurious

interrupt. A spurious interrupt is an interrupt that has been cleared before it was serviced. Since all

interrupt sources on the MAC72xx require explicit clearing, this indicates either a software

problem or an external interrupt that is self clearing.

14.6.1

Enabling the INTC

It is not necessary to enable the Interrupt Controller before it can be used. However, by default after reset,

no interrupts are enabled. Please refer to the INTC Block Guide for information about initialization of the

Interrupt Controller.

14.7

The Interrupt Controller Module (INTC)

For the required controller, the 64 fully-programmable interrupt sources service both the on-platform

peripherals as well as providing interrupt support for off-platform logic. The split between

off-/on-platform interrupt sources is dependent upon the exact platform peripheral configuration and the

number of sources needed to support it. Typically, the optional interrupt controllers support off-platform

requests.

Figure 14-1 presents a simplified block diagram for the interrupt controller.

MAC7200 Datasheet(PDF) 368 Page - Freescale Semiconductor, Inc