MAC7200 datasheet(383/976 Pages) FREESCALE

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Memory Map/Register Definition

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

305

vector_number =

64 + ipi_int[x] (for a single INTC implementation)

If there is no pending IRQ interrupt request when the read of the IRQIACK is performed, the interrupt

controller returns a value of 63 signalling a spurious interrupt. This is also the reset value of the register.

Any attempted write to this register generates an error termination.

See Figure 14-11 and Figure 14-16 for the IRQIACK definition.

14.8.1.11 FIQ Interrupt Acknowledge Register (FIQIACK)

The FIQIACK register is a read-only resource containing the vector number of the interrupt request

currently being processed. It is typically read early in an FIQ interrupt service routine. There is a fixed

association between the vector number returned in the FIQIACK register and the physical interrupt request

input signal, namely:

vector_number =

64 + ipi_int[x] (for a single INTC implementation)

If there is no pending FIQ interrupt request when the read of the FIQIACK is performed, the interrupt

controller returns a value of 63 signalling a spurious interrupt. This is also the reset value of the register.

Any attempted write to this register generates an error termination.

See Figure 14-12 and Figure 14-17 for the FIQIACK definition.

76543210

Interrupt Vector[7:0]

—

RESET:

00111111

= Unimplemented or Reserved

Figure 14-11. IRQ Interrupt Acknowledge Register (IRQIACK)

Table 14-16. IRQ Interrupt Acknowledge Register (IRQIACK) 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 IRQ request when the IRQIACK is read, a spurious interrupt vector number (63) is returned.

MAC7200 Datasheet(PDF) 383 Page - Freescale Semiconductor, Inc