mc56f801 Freescale Semiconductor, Inc, mc56f801 Datasheet - Page 60

• Manufacturer Part Number: mc56f801
• Description: 16-bit Digital Signal Controllers
• Manufacturer: Freescale Semiconductor, Inc

5.6.16.2
These read-only bits reflect the state of the new interrupt priority level bits being presented to the 56800E
core. These bits indicate the priority level needed for a new IRQ to interrupt the current interrupt being
sent to the 56800E core. This field is only updated when the 56800E core jumps to a new interrupt service
routine.
Note:
5.6.16.3
This read-only field shows the vector number (VAB[6:0]) used at the time the last IRQ was taken. In the
case of a Fast Interrupt, it shows the lower address bits of the jump address. This field is only updated when
the 56800E core jumps to a new interrupt service routine.
Note:
5.6.16.4
This bit allows all interrupts to be disabled.
5.6.16.5
This bit field is reserved or not implemented. It is read as 1 and cannot be modified by writing.
5.6.16.6
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
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00 = Required nested exception priority levels are 0, 1, 2, or 3
01 = Required nested exception priority levels are 1, 2, or 3
10 = Required nested exception priority levels are 2 or 3
11 = Required nested exception priority level is 3
0 = Normal operation (default)
1 = All interrupts disabled
Nested interrupts may cause this field to be updated before the original interrupt service routine can
read it.
Nested interrupts may cause this field to be updated before the original interrupt service routine can
read it.
Interrupt Priority Level (IPIC)—Bits 14–13
Vector Number - Vector Address Bus (VAB)—Bits 12–6
Interrupt Disable (INT_DIS)—Bit 5
Reserved—Bits 4–2
Reserved—Bits 1–0
IPIC_VALUE[1:0]
00
01
10
11
Table 5-3 Interrupt Priority Encoding
56F8014 Technical Data, Rev. 9
No interrupt or SWILP
Current Interrupt
Priority Level
Priority 2 or 3
Priority 0
Priority 1
Exception Priority
Priorities 0, 1, 2, 3
Required Nested
Priorities 1, 2, 3
Priorities 2, 3
Priority 3
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