Aic interrupt set command register, Aic end of interrupt command register – Rainbow Electronics AT75C310 User Manual
Page 39
AT75C310
39
AIC Interrupt Set Command Register
Register Name: AIC_ISCR
Access Type:
Write-only
•
NFIQ: NFIQ Status
0 = NFIQ line inactive
1 = NFIQ line active
•
NIRQ: NIRQ Status
0 = NIRQ line inactive
1 = NIRQ line active
AIC End of Interrupt Command Register
Register Name: AIC_EOICR
Access Type:
Write-only
The End of Interrupt Command Register is used by the interrupt routine to indicate that the interrupt handling is complete.
Any value can be written because it is only necessary to make a write to this register location to signal the end of interrupt
handling. The value written is taken by the AIC and used as the new interrupt priority level, i.e., if no interrupt was active
when the current routine was entered, zero is written. If an interrupt was active and interrupt nesting is enabled, the value
written should be the priority and interrupt number of the previous interrupt.
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
7
6
5
4
3
2
1
0
–
–
–
–
–
–
NIRQ
NFIQ
31
30
29
28
27
26
25
24
–
–
–
–
–
–
–
–
23
22
21
20
19
18
17
16
–
–
–
–
–
–
–
–
15
14
13
12
11
10
9
8
–
–
–
–
–
–
–
–
7
6
5
4
3
2
1
0
–
–
–
–
–
–
–
–