Register Descriptions
5.6.8.1
Fast Interrupt 0 Vector Address Low (FIVAL0)—Bits 15—0
The lower 16 bits of the vector address used for Fast Interrupt 0. This register is combined with FIVAH0
to form the 21-bit vector address for Fast Interrupt 0 defined in the FIM0 register.
5.6.9
Fast Interrupt 0 Vector Address High Register (FIVAH0)
Base + $8
Read
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
0
4
3
2
1
0
0
FAST INTERRUPT 0 VECTOR
ADDRESS HIGH
Write
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
RESET
Figure 5-11 Fast Interrupt 0 Vector Address High Register (FIVAH0)
Reserved—Bits 15–5
5.6.9.1
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
5.6.9.2 Fast Interrupt 0 Vector Address High (FIVAH0)—Bits 4–0
The upper five bits of the vector address used for Fast Interrupt 0. This register is combined with FIVAL0
to form the 21-bit vector address for Fast Interrupt 0 defined in the FIM0 register.
5.6.10 Fast Interrupt 1 Match Register (FIM1)
Base + $9
Read
15
0
14
0
13
0
12
0
11
0
10
0
9
0
8
0
7
0
6
0
5
0
4
0
3
2
1
0
0
0
FAST INTERRUPT 1
Write
0
0
0
0
0
0
0
0
0
0
0
0
RESET
Figure 5-12 Fast Interrupt 1 Match Register (FIM1)
5.6.10.1 Reserved—Bits 15–6
This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.
5.6.10.2 Fast Interrupt 1 Vector Number (FAST INTERRUPT 1)—Bits 5–0
These values determine which IRQ will be Fast Interrupt 1. 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.
56F8014 Technical Data, Rev. 9
Freescale Semiconductor
Preliminary
57
FREESCALE [ Freescale ]
