2−22

2.9.3

VECINT: Vector Interrupt Register

This register contains a vector value identifying the internal interrupt source that trapped to location 0003h. Writing

any value to this register removes the vector and updates the next vector value (if another interrupt is pending). Note

that the vector value is offset. Therefore, its value is in increments of two (bit 0 is set to 0). When no interrupt is pending,

the vector is set to 00h. Table 2−8 is a table of the vector interrupt values. As shown, the interrupt vector is divided

into two fields, I[2:0] and G[3:0]. The I-field defines the interrupt source within a group (on a first-come, first-served

basis) and the G-field defines the group number. Group G0 is the lowest and G15 is the highest priority.

7

6

5

4

3

210

G3

G2

G1

G0

I2

I1

I0

0

R/W

R/W

R/W

R/W

R/W

R/W

R/W

R/O

BIT

NAME

RESET

FUNCTION

3−1

I[2:0]

000

This field defines the interrupt source in a given group. See Table 2−8, Vector Interrupt Values.

Bit 0 is always 0; therefore, vector values are offset by two.

7−4

G[3:0]

0000

This field defines the interrupt group. I[2:0] and G[3:0] combine to produce the actual interrupt vector.

Table 2−8. Vector Interrupt Values

G[3:0]

(Hex)

I[2:0]

(Hex)

VECTOR

(Hex)

INTERRUPT SOURCE

0

0

00

No interrupt

1

0

10

RESERVED

1

1

12

Output endpoint 1

1

2

14

Output endpoint 2

1

3

16

Output endpoint 3

1

4−7

18−1E

RESERVED

2

0

20

RESERVED

2

1

22

Input endpoint 1

2

2

24

Input endpoint 2

2

3

26

Input endpoint 3

2

4−7

28−2E

RESERVED

3

0

30

STPOW packet received

3

1

32

SETUP packet received

3

2

34

PWON interrupt

3

3

36

PWOFF interrupt

3

4

38

RESR interrupt

3

5

3A

SUSR interrupt

3

6

3C

RSTR interrupt

3

7

3E

RESERVED

4

0

40

I2C TXE interrupt

4

1

42

I2C RXF interrupt

4

2

44

Input endpoint 0

4

3

46

Output endpoint 0

4

4−7

48

→ 4E

RESERVED

5−15

X

90

→ FE

RESERVED