mc56f801 Freescale Semiconductor, Inc, mc56f801 Datasheet - Page 56

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

5.6.6
5.6.6.1
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
5.6.6.2
The value in this register is used as the upper 14 bits of the interrupt vector VAB[20:0]. The lower 7 bits
are determined based on the highest priority interrupt and are then appended onto VBA before presenting
the full VAB to the Core.
5.6.7
5.6.7.1
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
5.6.7.2
These values determine which IRQ will be Fast Interrupt 0. Fast Interrupts vector directly to a service
routine based on values in the Fast Interrupt Vector Address registers without having to go to a jump table
first. IRQs used as Fast Interrupts must be set to priority level 2. Unexpected results will occur if a Fast
Interrupt vector is set to any other priority. A Fast Interrupt automatically becomes the highest-priority
level 2 interrupt regardless of its location in the interrupt table prior to being declared as Fast Interrupt.
Fast Interrupt 0 has priority over fast Interrupt 1. To determine the vector number of each IRQ, refer to the
vector table.
5.6.8
56
Base + $5
Base + $6
Base + $7
RESET
RESET
RESET
Read
Write
Write
Write
Read
Read
Vector Base Address Register (VBA)
Fast Interrupt Match 0 Register (FIM0)
Fast Interrupt 0 Vector Address Low Register (FIVAL0)
Reserved—Bits15—14
Vector Address Bus (VAB)—Bits 13—0
Reserved—Bits 15–6
Fast Interrupt 0 Vector Number (FAST INTERRUPT 0)—Bits 5–0
Figure 5-10 Fast Interrupt 0 Vector Address Low Register (FIVAL0)
15
15
15
0
0
0
0
0
14
Figure 5-9 Fast Interrupt Match 0 Register (FIM0)
0
0
14
14
Figure 5-8 Vector Base Address Register (VBA)
0
0
0
13
0
13
13
0
0
0
12
0
12
12
0
0
0
56F8014 Technical Data, Rev. 9
11
0
11
11
0
0
0
FAST INTERRUPT 0 VECTOR ADDRESS LOW
10
0
10
10
0
0
0
9
0
9
0
0
9
0
VECTOR_BASE_ADDRESS
8
0
8
0
0
8
0
7
7
0
0
0
7
0
6
6
6
0
0
0
0
5
0
5
0
5
0
4
4
0
0
4
0
FAST INTERRUPT 0
3
3
3
0
0
0
Freescale Semiconductor
2
0
2
0
2
0
1
0
1
0
1
0
Preliminary
0
0
0
0
0
0