Fujitsu M2301B Manual page 70

(1) During Acceleration (when motor is rotating slowly) DeMeNT is "0".
ClKS
L
CK
(CHOPPER
for
ClKS)
u
u
u
DECR
CE
DCMCNT
;"0" in the state of accelerating.
(2) During Deceleration (when the motor is rotating fast) DeMeNT is "1".
ClKS
--.J
L
CK
U U
U
u
DECR
U
U
u
CE
I
DCMCNT
/"'" in the state of decelerating.
Fig.4.13 DC Spindle Motor Control Timing Chart (1)