56F8347 datasheet(101/176 Pages) FREESCALE

101 / 176 page

56F8347 Technical Data, Rev. 3.0

Freescale Semiconductor

101

Preliminary

5.6.15.1

Reserved—Bits 15–7

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

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 the 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.

Base + $F

Read

FAST INTERRUPT 1

VECTOR ADDRESS LOW

Write

RESET

00000000

Base + $10

Read

FAST INTERRUPT 1

VECTOR ADDRESS HIGH

Write

RESET

00000000

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