Samsung S3C80M4/F80M4, Руководство пользователя

Страница: 86 / 249

INTERRUPT STRUCTURE S3C80M4/F80M4
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 (V
1
) + one source (S
1
)
Type 2: One level (IRQn) + one vector (V
1
) + multiple sources (S
1
– S
n
)
Type 3: One level (IRQn) + multiple vectors (V
1
– V
n
) + multiple sources (S
1
– S
n
, S
n+1
– S
n+m
)
In the S3C80M4 microcontroller, two interrupt types are implemented.
Vectors Sources Levels
S
1
V
1
S
2
Type 2: IRQn
S
3
S
n
V
1
S
1
V
2
S
2
Type 3: IRQn
V
3
S
3
V
1
S
1
Type 1: IRQn
V
n
S
n +
1
S
n
S
n +
2
S
n +
m
NOTES:
1. The number of S
n
and V
n
value is expandable.
2. In the S3C80M4 implementation,
interrupt types 1 is used.
Figure 5-1. S3C8-Series Interrupt Types