10-6
MB86R02 ‘Jade-D’ Hardware Manual V1.64
10.5.3 External interrupt request register (EIREQ)
This register is to indicate and clear external interrupt request.
Address
FFFE_4000
H
+ 04
H
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Name
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
–
R/W
R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial value
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
–
–
–
–
–
–
–
–
–
–
–
–
REQ
3
REQ
2
REQ
1
REQ
0
R/W
R/W R/W R/W R/W R/W R/W R/W R/W
R0
R0
R0
R0 R/W0 R/W0 R/W0 R/W0
Initial value
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
Bit field
Description
No.
Name
31-8
–
Unused bit.
Write access is ignored. Read value of these bits is undefined.
7-4
–
Unused bit.
Write access is ignored. Read value of these bits is always "0".
3-0
REQ3-0
External interrupt request is indicated and cleared.
0
At reading:
There is no external interrupt request
At writing: External interrupt request is cleared
1
At reading:
There is external interrupt request
At writing: External interrupt request invalid
Read value of "1" shows external interrupt is requested. These bits correspond to
external interrupt channel as follows.
REQ0: External interrupt 0 (INT_A[0] pin)
REQ1: External interrupt 1 (INT_A[1] pin)
REQ2: External interrupt 2 (INT_A[2] pin)
REQ3: External interrupt 3 (INT_A[3] pin)
When "0" is written to these bits, external interrupt request is cleared.
Writing "1" is invalid. These bits are initialized to "0000
B
" by reset.
Содержание MB86R02
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