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res s
D e s c r i p t i o n
0 0 0 9
D M A C o n t r o l l e r
IOW- =
0, Write
R e q u e s t R e g i s t e r
B i t
D e s c r i p t i o n
B i t s 0-1
B i t 1
B i t
0
0
0
Select
C h a n n e l 0
0
1
Select
C h a n n e l
1
1
0
Select C h a n n e l
2
1
1
Select
C h a n n e l 3
B i t
2
0
R e s e t R e q u e s t B i t
1
Set R e q u e s t B i t
B i t s 3-7
Don
I
t
C a r e
,
IOR-
= 0 ,
I l l e g a l
OOOA
D M A C o n t r o l l e r
IOW- = 0 ,
W r i t e S i n g l e Mask R e g i s t e r
B i t
D e s c r i p t i o n
B i t s
0-1
B i t
1
B i t
0
0
0
Select
C h a n n e l 0 Mask B i t
0
1
Select
C h a n n e l 1 Mask B i t
1
0
Select C h a n n e l
2 Mask B i t
1
1
Select C h a n n e l 3
Mask B i t
B i t
2
0
C l e a r Mask B i t ( E n a b l e C h a n n e l )
1
Set Mask B i t ( D i s a b l e C h a n n e l )
B i t s 3-7
Don'
t
C a r e
IOR- = 0 , I l l e g a l
28
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