C i r cu i t Descr i p t i on ( con t ' d )
Ke y p a d
T h e f o l l ow i ng s i g na l s con t r o l
t h e
co l umn d i g i t s o f t h e k e y p a d .
P i n
T e r m i n a t e s
PA4
6
P 2
p i n
5C
PA5
7
P 2
p i n
6C
PA6
8
P 2
p i n
7C
PA7
9
P 2
p i n
8C
T h e fo l l ow i ng s i g na l s con t r o l
t he
row d i g i t s o f
t h e k e y p a d .
P i n
T e r m i n a t e s
P 8 3
1 3
P 2
p i n
1 1 8
P B 4
1 4
P 2
p i n
1 2B
P B 5
1 5
P 2
p i n
1 3B
PB6
1 6
P 2
p i n
1 48
PB7
1 7
P 2
p i n 1 5B
Hoppe r
T he
fo l l ow i ng s i gn a l s con t r o l
t h e
hop p e r mo t o r f o r w a r d a n d r e v e r se .
PBO
P B 1
P B 2
P i n
1 0
1 1
1 2
5ms I n t e r r u p t
Te rm i n a t e s
P 2 p i n 1 1 A
P 2 p i n 2 1 C
P 2 p i n 1 0B
So f t wa r e con t r o l s a n i n t e r n a l t i mer
wh i c h
p r o v i des a n i n t e r r u p t eve r y
5ms .
U29 p i n 2 1 sends t h e
5ms
I n t e r r u p t
( V I A 1 )
s i gn a l
s i mu l t a neous l y t v U9 p i n 2 a n d U 1 0 1
p i n 7 . See I n t e r r u p t Cyc l e i n t h i s
Sec t i on .
U 1 0 1
p i n 1 7 sends VPA
to t h e
m i c r op r ocessor
( U 1 p i n 2 1 ) .
VPA
causes t h e l e ve l 5 i n t e r r u p t to be
h a nd l e d as an a u t o v e c t o r .
3 . MPU BOARD
NOT E S
3 - 4 9
Summary of Contents for 5000 Plus
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