MAC7200 datasheet(384/976 Pages) FREESCALE

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Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

306

Freescale Semiconductor

14.9

Functional Description

This section provides an overview of the functional operation of the INTC module.

14.9.1

Interrupt Controller Theory of Operation

To support the interrupt architecture of the ARM core programming model, the combined 64 interrupt

sources are organized as 16 levels, with an arbitrary number of requests programmed to each level.

Consider the priority structure within a single interrupt level (from highest to lowest priority):

level i:ipi_int[a]

programmed as level i (highest priority)

ipi_int[b]

programmed as level i

ipi_int[c]

programmed as level i

ipi_int[d]

programmed as level i (lowest priority)

where the bit numbers [a,b,c,d] are defined such that a > b > c > d. In this example, 4 programmable

interrupt sources are mapped into a single interrupt level.

The operation of the interrupt controller can be broadly partitioned into three activities:

•

Recognition

•

Prioritization

•

Vector Generation during IACK

Recall the INTC is designed to provide a unique vector number for each interrupt request. This allows the

operating system kernel to manage a vector table of addresses defining the starting location for each

interrupt service routine. Throughout this discussion, it is assumed that the vector table contains 32-bit

76543210

Interrupt Vector[7:0]

—

RESET:

00111111

= Unimplemented or Reserved

Figure 14-12. FIQ Interrupt Acknowledge Register (FIQIACK)

Table 14-17. FIQ Interrupt Acknowledge Register (FIQIACK) Field Descriptions

Name

Description

7–0

Interrupt Vector

Interrupt Vector Number

This 8-bit field provides the vector number for the interrupt request currently being acknowledged. The

vector number is derived from the physical interrupt request signal as:

vector_number = 64 + ipi_int[x]

If there is no pending FIQ request when the FIQIACK is read, a spurious interrupt vector number (63) is

returned.

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