MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 843

• Manufacturer Part Number: MPC555CME
• Description: KIT EVALUATION FOR MPC555
• Manufacturer: Freescale Semiconductor
• Type: Microcontrollerr

Specifications of MPC555CME

• Contents: Module Board, Installation Guide, Power Supply, Cable, Software and more
• Processor To Be Evaluated: MPC555
• Data Bus Width: 32 bit
• Interface Type: RS-232
• For Use With/related Products: MPC555
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

D.11 Fast Quadrature Decode TPU Function (FQD)
MPC555 / MPC556
USER’S MANUAL
FQD is a position feedback function for motor control. It decodes the two signals from
a slotted encoder to provide the CPU with a 16-bit free-running position counter. FQD
incorporates a “speed switch” which disables one of the channels at high speed, al-
lowing faster signals to be decoded. A time stamp is provided on every counter update
to allow position interpolation and better velocity determination at low speed or when
low resolution encoders are used. The third index channel provided by some encoders
is handled by the ITC function. See Motorola TPU Progamming Note
Decode TPU Function (FQD), (TPUPN02/D).
Figure D-19
primary and secondary channels, respectively.
and
Figure D-20
TPU ROM FUNCTIONS
show the host interface areas for the FQD function for
Rev. 15 October 2000
Fast Quadrature
MOTOROLA
D-29