DSP56303 datasheet(76/292 Pages) FREESCALE

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DSP56303 User’s Manual, Rev. 2

4-18

Freescale Semiconductor

Core Configuration

4.4.3 Processing Interrupt Source Priorities Within an IPL

If more than one interrupt request is pending when an instruction executes, the interrupt source

with the highest IPL is serviced first. When several interrupt requests with the same IPL are

pending, another fixed-priority structure within that IPL determines which interrupt source is

serviced first. Table 4-6 shows this fixed-priority list of interrupt sources within an IPL, from

highest to lowest at each level The interrupt mask bits in the Status Register (I[1–0]) can be

programmed to ignore low priority-level interrupt requests.

VBA:$44

0–2

ESSI1 receive last slot

VBA:$46

0–2

ESSI1 transmit data

VBA:$48

0–2

ESSI1 transmit data with exception status

VBA:$4A

0–2

ESSI1 transmit last slot

VBA:$4C

0–2

Reserved

VBA:$4E

0–2

Reserved

VBA:$50

0–2

SCI receive data

VBA:$52

0–2

SCI receive data with exception status

VBA:$54

0–2

SCI transmit data

VBA:$56

0–2

SCI idle line

VBA:$58

0–2

SCI timer

VBA:$5A

0–2

Reserved

VBA:$5C

0–2

Reserved

VBA:$5E

0–2

Reserved

VBA:$60

0–2

Host receive data full

VBA:$62

0–2

Host transmit data empty

VBA:$64

0–2

Host command (default)

VBA:$66

0–2

Reserved

VBA:$FE

0–2

Reserved

Table 4-6. Interrupt Source Priorities Within an IPL

Priority

Interrupt Source

Level 3 (nonmaskable)

Highest

Hardware RESET

Stack error

Table 4-5. Interrupt Sources (Continued)

Interrupt

Starting Address

Interrupt

Priority Level

Range

Interrupt Source

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