CY545 Stepper System Controller
www.ControlChips.com
If INHIBIT_ABORT is driven low during a motion, the CY545 switches to a deceleration mode. It
will decelerate symmetrically to the acceleration, until it achieves the selected initial stepping
rate (First Rate parameter). The CY545 will then test the INHIBIT_ABORT signal once for each
step, and if it is low, the motion will stop. Otherwise, the motion will continue, at the starting rate,
until the target position is reached. To slow down the motor and stop when the initial step rate is
reached, simply hold the INHIBIT_ABORT signal low until the CY545 brings the STOPPED
signal high again. Several cases are illustrated below.
CW_LIMIT and CCW_LIMIT
The CY545 also provides two inputs for immediately stopping a motion, the CW_LIMIT and
CCW_LIMIT signals. If the relevant signal goes low during a motion in that direction, the CY545
immediately stops the motion. There will be no deceleration before the stop; the CY545 simply
abandons the motion.
Also, if a limit signal is low at the beginning of a motion, the motion will not be taken. The CY545
immediately aborts the motion without taking any steps. Normal motions are allowed in the
opposite direction. Example waveforms are shown above.
© 2002 Cybernetic Micro Systems
71
Chapter 16 - Timing and Control
ETC [ ETC ]
