C i r cu i t Descr i pt i on ( cont ' d )
When r eques t i ng
a
m i c r o p r ocessor
I n t e r r up t ,
U23 ( U 2 2 ) p i n 21
sends
an
I n t e r r up t s i gn a l
s i mu l t aneous
t o :
( 1 )
t he se l e c t o r / I n t e r r up t ,
U 1 0 1
p i n 2 2 ( p i n 2 1 ) .
T h e n ,
U 1 0 1 p i n 1 7 sends VPA
t o t he m i c r o p r ocessor
( U 1
p i n
2 1 ) .
( 2 )
t he p r i o r i t y e n code r , U9 p i n
4 .
T h e n ,
U9
de t e r m i nes
t he
h i g h e s t p r i o r i t y
I n t e r r u p t
r eque s t
a n d sends t he
l eve l 4
I n t e r r u p t
t o
t he
m i c r o p r ocessor
us i ng
t he
I n t e r r up t
p r i or i t y
l eve l
I I nes a s fo I l ows .
I PLO
U1 p i n 25
I P L 1
U 1 p i n 24
I PL 2
U 1 p i n
2 3
See
Cyc l e
I n
t h i s
Sec t i on .
The
m i c r o p r ocessor
sends
I t s
funct i on
s t a t us t o U 4 2 us i ng
t he
f unc t i on
code
ou t pu t
l i nes
a s
fo I l ows .
FCO
U 1 p i n 28
FC1
U 1
p i n
27
FC2
U 1 p i n 26
U42 p i n 6 sends t he i'Aci< s i gna l
t o
U 1 0 1 p i n 4 .
When t he m i c r o p r ocessor
r ece i ves
t he
l eve l 4 I n t e r r u p t and t he VPA ,
t he m i c r op rocessor beg i ns e x cep t i on
p r ocess i ng .
The
m i c r op r ocessor
s i gna l s
t he
I eve I
4
I n t e r r u p t
t o U 1 0 1
on
a d d r e s s
l i nes ,
A 1
( p i n 1 ) , A2
( p l n 2 ) , and A3 ( p i n 3 ) .
U 1 0 1
uses
t he
UART
I n t e r r up t
s i gna l ,
l ACK ,
and t he
a d d r e s s
s i gna l t o de t e r m i ne t he dev i ce I s a
68000 .
3 . MPU BOARD
NOT ES
3-53
Summary of Contents for 5000 Plus
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