at75c220 ATMEL Corporation, at75c220 Datasheet - Page 56
at75c220
Manufacturer Part Number
at75c220
Description
Smart Internet Appliance Processor Siap
Manufacturer
ATMEL Corporation
Datasheet
1.AT75C220.pdf
(144 pages)
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•
AIC Source Vector Registers
Register Name: AIC_SVR0...AIC_SVR31
Access Type:Read/write
Reset Value:
•
AIC Interrupt Vector Registers
Register Name: AIC_IVR
Access Type:Read-only
Reset Value:
•
56
SRCTYPE
0
0
1
1
SRCTYPE: Interrupt Source Type
Vector
IRQV
Programs the input to be positive- or negative-edge triggered or positive- or negative-level sensitive.
The active level or edge is not programmable for the internal sources.
In these registers, the user may store the addresses of the corresponding handler for each interrupt source.
The IRQ Vector Register contains the vector programmed by the user in the Source Vector Register corresponding to
the current interrupt. The SVR Register (1 to 31) is indexed by the current interrupt number when the IVR register is
read. When there is no interrupt, the IRQ register reads 0.
31
23
15
31
23
15
7
7
0
1
0
1
Internal Sources
Edge-triggered
Edge-triggered
Level-sensitive
Level-sensitive
30
22
14
30
22
14
0
6
0
6
AT75C220
Negative-edge triggered
Positive-edge triggered
29
21
13
29
21
13
High-level sensitive
Low-level sensitive
5
5
External Sources
28
20
12
28
20
12
4
4
Vector
Vector
Vector
Vector
IRQV
IRQV
IRQV
IRQV
27
19
11
27
19
11
3
3
26
18
10
26
18
10
2
2
25
17
25
17
9
1
9
1
24
16
24
16
8
0
8
0
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