Tandy 1000 SL Technical Reference Manual page 318

DIRECTION SELECT (51-18, m R ) Step-out S t e p - i n
1
-
STEP ( J 1 - 2 0 , M )
I U U
u 1 u
---
I
4 -
D i r e c t i o n l a t c h i n
Ul
96tpi
:
I n t e r n a l s t e p gen. i n U1
SOD(0verdrive t i m e r 2)
o u t p u t
Coil d r i v e r i n p u t
P A
PB
P N A
P N B
4 8 t p i
:
I n t e r n a l s t e p g e n . i n
U 1
SOD(0verdrive t i m e r
2 )
C o i l d r i v e r i n p u t
o u t p u t
PA
PB
P N B
P N B
tl: I n t e r n a l s t e p d e l a y (3msec, a p p r o x . )
t 2 :
P a r t i a l 2-phase a c t i v a t i n g p e r i o d (0.6ms,approx.)
(Fig.211) S t e p p i n g motor c o n t r o l c i r c u i t waveform
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239
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