56F8167 datasheet(104/184 Pages) FREESCALE

104 / 184 page

56F8367 Technical Data, Rev. 7.0

104

Freescale Semiconductor

Preliminary

5.6.15.2

Fast Interrupt 1 Vector Number (FAST INTERRUPT 1)—Bits 6–0

This value determines which IRQ will be a 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; see Part 5.3.3. 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. Fast interrupts automatically become the

highest-priority level 2 interrupt, regardless of their 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 Table 4-5.

5.6.16

Fast Interrupt 1 Vector Address Low Register (FIVAL1)

Figure 5-18 Fast Interrupt 1 Vector Address Low Register (FIVAL1)

5.6.16.1

Fast Interrupt 1 Vector Address Low (FIVAL1)—Bits 15–0

The lower 16 bits of vector address are used for Fast Interrupt 1. This register is combined with FIVAH1

to form the 21-bit vector address for Fast Interrupt 1 defined in the FIM1 register.

5.6.17

Fast Interrupt 1 Vector Address High Register (FIVAH1)

Figure 5-19 Fast Interrupt 1 Vector Address High Register (FIVAH1)

5.6.17.1

Reserved—Bits 15–5

This bit field is reserved or not implemented. It is read as 0 and cannot be modified by writing.

5.6.17.2

Fast Interrupt 1 Vector Address High (FIVAH1)—Bits 4–0

The upper five bits of vector address are used for Fast Interrupt 1. This register is combined with FIVAL1

to form the 21-bit vector address for Fast Interrupt 1 defined in the FIM1 register.

5.6.18

IRQ Pending 0 Register (IRQP0)

Figure 5-20 IRQ Pending 0 Register (IRQP0)

Base + $F

Read

FAST INTERRUPT 1 VECTOR

ADDRESS LOW

Write

RESET

00000

0000000

0000

Base + $10

Read

FAST INTERRUPT 1 VECTOR

ADDRESS HIGH

Write

RESET

00000

0000000

0000

Base + $11

Read

PENDING [16:2]

Write

RESET

11111

1111111

1111

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