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Configuring Interrupts
4
-22
DSP56303 User’s Manual
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:$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
Illegal instruction
Debug request interrupt
Trap
Lowest
Nonmaskable interrupt
Table 4-5. Interrupt Sources (Continued)
Interrupt
Starting Address
Interrupt
Priority Level
Range
Interrupt Source
Содержание DSP56303
Страница 1: ...DSP56303 User s Manual 24 Bit Digital Signal Processor DSP56303UM AD Revision 1 January 2001 ...
Страница 52: ...JTAG OnCE Interface 2 22 DSP56303 User s Manual ...
Страница 114: ...General Purpose Input Output GPIO 5 10 DSP56303 User s Manual ...
Страница 212: ...GPIO Signals and Registers 8 26 DSP56303 User s Manual ...
Страница 268: ...Interrupt Equates A 22 DSP56303 User s Manual ...
Страница 306: ...Programming Sheets B 38 DSP56303 User s Manual ...
Страница 320: ...Index 14 DSP56303 User s Manual ...