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INTERRUPT STRUCTURE S3C84E5/C84E9/P84E9
5-2
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 (V1) + one source (S1)
Type 2: One level (IRQn) + one vector (V1) + multiple sources (S1 – Sn)
Type 3: One level (IRQn) + multiple vectors (V1 – Vn) + multiple sources (S1 – Sn
, Sn+1
– Sn+m)
In the S3C84E5/C84E9/P84E9 microcontroller, two interrupt types are implemented.
Vectors SourcesLevels
S1
V1 S2
Type 2:
IRQn
S3
Sn
V1
S1
V2
S2
Type 3:
IRQn
V3
S3
V1 S1
Type 1:
IRQn
Vn
S n +1
Sn
S n +2
S n +m
NOTES:
1. The number of Sn and Vn value is expandable
2. In the S3C84E5/C84E9/P84E9 implementation, interrupt types 1 and 3 are used.
Figure 5-1. S3C8-Series Interrupt Types