MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 818

• 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.2 Programmable Time Accumulator (PTA)
MPC555 / MPC556
USER’S MANUAL
TPUMCR 2. It is good practice always to initialize any write once register to ensure
an incorrect value is not accidentally written.
The descriptions below document the functions listed in
D-2
PTA accumulates a 32-bit sum of the total high time, low time, or period of an input
signal over a programmable number of periods or pulses. The period accumulation
can start on a rising or falling edge. After the specified number of periods or pulses,
the PTA generates an interrupt request.
From one to 255 period measurements can be accumulated before the TPU interrupts
the CPU, providing instantaneous or average frequency measurement capability. See
Motorola TPU Progamming Note
(PTA), (TPUPN06/D).
Figure D-2
(Bank 1) of the TPU3 ROM module.
shows all of the host interface areas for the PTA function.
TPU ROM FUNCTIONS
Rev. 15 October 2000
Programmable Time Accumulator TPU Function
Table D-1
(Bank 0) and
MOTOROLA
Table
D-4