MPC555CME Freescale Semiconductor, MPC555CME Datasheet - Page 852
MPC555CME
Manufacturer Part Number
MPC555CME
Description
KIT EVALUATION FOR MPC555
Manufacturer
Freescale Semiconductor
Type
Microcontrollerr
Datasheet
1.MPC555CME.pdf
(966 pages)
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
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D.15 Discrete Input/Output (DIO)
MPC555 / MPC556
USER’S MANUAL
The DIO function allows a TPU channel to be used as a digital I/O pin.
When a pin is used as a discrete input, a parameter indicates the current input level
and the previous 15 levels of a pin. Bit 15, the most significant bit of the parameter,
indicates the most recent state. Bit 14 indicates the next most recent state, and so on.
The programmer can choose one of the three following conditions to update the pa-
rameter:
When a pin is used as a discrete output, it is set high or low only upon request by the
CPU. See Motorola TPU Progamming Note
(DIO), (TPUPN18/D).
Figure D-24
1. when a transition occurs
2. when the CPU makes a request, or
3. when a rate specified in another parameter is matched
shows the host interface areas for the DIO function.
TPU ROM FUNCTIONS
Rev. 15 October 2000
Discrete Input/Output TPU Function
MOTOROLA
D-38
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