DSP56857 datasheet(189/662 Pages) FREESCALE

189 / 662 page

Overview, Rev. 4

Freescale Semiconductor

8-11

8.7.3.4 Reserved—Bits 9–8

These bits are reserved, or are not implemented. They are read as 0, but they cannot be modified

by writing.

8.7.3.5 PLL Loss of Lock Interrupt Priority Level (LOCK IPL)—Bits 7–6

This bit field is used to set the interrupt priority levels for certain EOnCE IRQs. These IRQs are

limited to priorities one through three and are disabled by default.

•

00 = IRQ disabled (default)

•

01 = IRQ is priority level 0

•

10 = IRQ is priority level 1

•

11 = IRQ is priority level 2

8.7.3.6 Reserved—Bits 5–4

These bits are reserved, or are not implemented. They are read as 0, but cannot be modified by

writing.

8.7.3.7 External IRQ B Interrupt Priority Level (IRQB IPL)—Bits 3–2

This bit field is used to set the interrupt priority levels for certain EOnCE IRQs. These IRQs are

limited to priorities one through three and are disabled by default.

•

00 = IRQ disabled (default)

•

01 = IRQ is priority level 0

•

10 = IRQ is priority level 1

•

11 = IRQ is priority level 2

8.7.3.8 External IRQ A Interrupt Priority Level (IRQA IPL)—Bits 1–0

This bit field is used to set the interrupt priority levels for certain peripheral IRQs. These IRQs

are limited to priorities zero through two and are disabled by default.

•

00 = IRQ disabled (default)

•

01 = IRQ is priority level 0

•

10 = IRQ is priority level 1

•

11 = IRQ is priority level 2

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