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INTERRUPT STRUCTURE
INTERRUPT TYPES
The three components of the S3C8 interrupt structure described before ⎯ levels, vectors, and sources ⎯ are
combined to determine the interrupt structure of an individual device and to make full use of its available interrupt
logic. There are three possible combinations of interrupt structure components, called interrupt types 1, 2, and 3.
The types differ in the number of vectors and interrupt sources assigned to each level (see Figure 5-1):
Type 1:
One level (IRQn) + one vector (V
Type 2:
One level (IRQn) + one vector (V
Type 3:
One level (IRQn) + multiple vectors (V
In the S3C8275X/C8278X/C8274X microcontroller, two interrupt types are implemented.
Type 1:
Type 2:
Type 3:
NOTES:
1. The number of S
2. In the S3C8275X/C8278X/C8274X implementation,
5-2
Levels
IRQn
IRQn
IRQn
and V
n
n
interrupt types 1 and 3 are used.
Figure 5-1. S3C8-Series Interrupt Types
S3C8275X/F8275X/C8278X/F8278X/C8274X/F8274X
) + one source (S
)
1
1
) + multiple sources (S
1
− V
) + multiple sources (S
1
n
Vectors
V
1
V
1
V
1
V
2
V
3
V
n
value is expandable.
− S
)
1
n
− S
, S
1
n
n+1
Sources
S
1
S
1
S
2
S
3
S
n
S
1
S
2
S
3
S
n
S
1
n +
S
2
n +
S
m
n +
− S
)
n+m
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