DSP56857 datasheet(186/662 Pages) FREESCALE

186 / 662 page

5685X Digital Signal Controller User Manual, Rev. 4

8-8

Freescale Semiconductor

8.7 Register Descriptions (ITCN_BASE = $1FFF20)

8.7.1 Interrupt Priority Register 0 (IPR0)

Figure 8-3. Interrupt Priority Register 0 (IPR0)

See Programmer’s Sheet on Appendix page B - 21

8.7.1.1 Reserved—Bits 15–14

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

writing.

8.7.1.2 EOnCE Breakpoint Unit 0 Interrupt Priority Level

(BKPT_U0 IPL)—Bits 13–12

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 1

•

10 = IRQ is priority level 2

•

11 = IRQ is priority level 3

8.7.1.3 EOnCE Step Counter Interrupt Priority Level

(STPCNT IPL)—Bits 11–10

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 1

•

10 = IRQ is priority level 2

•

11 = IRQ is priority level 3

8.7.1.4 Reserved—Bits 9–0

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

writing.

Base + $0

Read

BKPT_U0 IPL STPCNT IPL

Write

Reset

000

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