Timing Diagrams
Step
Td
Dir
A
B
C
D
Tp
Tsu
Figure 1. Circuit Timing
ELM312
Th
ELM312DSB
Step
1
2
3
4
5
6
7
8
Output Logic Level
A
B
C
D
H
L
L
L
H
H
L
L
L
H
L
L
L
H
H
L
L
L
H
L
L
L
H
H
L
L
L
H
H
L
L
H
Figure 2. Stepping Sequence (Clockwise Direction)
Elm Electronics – Circuits for the Hobbyist
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