Commodore 8250LP - VIII. INTERFACE; Stepper Timing Diagrams; Stepper Voltage Control

C-3-
Stepper Timing Driven in Two Phases
DR rVE
STEP
- STEP
SELECT
DIRECTION
S;'W-3
SMD-2
SMD-4
S"1O-1
4n+0
I
C--L
Stepper Voltage
\\·he".
no
step
command
+1
+2
+3
to inner
or riO
selec:.ed
ste?per
is
s.,i tched
to +5V
to avoid
+4
t
+3
I
1
----+
12Y
... ·----+5v
+2
I
to outer
drive, +12V
supplied
to
pO\'rer consumption.