MC68HC912D60A MOTOROLA [Motorola, Inc], MC68HC912D60A Datasheet - Page 289
MC68HC912D60A
Manufacturer Part Number
MC68HC912D60A
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC912D60A.pdf
(460 pages)
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Technical Data — MC68HC912D60A
16.1 Contents
16.2 Introduction
MC68HC912D60A — Rev 3.0
MOTOROLA
16.2
16.3
16.4
16.5
16.6
16.7
16.8
The Motorola Interconnect Bus (MI Bus) is a serial communications
protocol which supports distributed real-time control efficiently and with a
high degree of noise immunity, at a typical data transfer bit rate of 20kHz.
The MI Bus is suitable for medium speed networks requiring very low cost
multiplex wiring; only one wire is required to connect to slave devices.
The MI Bus uses a push-pull sequence to transfer data. The master
device, which in this case is the MC68HC912D60A, sends a push field to
the slave devices connected to the bus. The push field contains data plus
an address that is recognized by one of the slaves. The slave addressed
returns data which the master pulls from the MI Bus over the same wire.
Specific details of the message format are covered later in this section.
The MCU (master) can take the bus at any time, with a start bit that
1. Related information on Motorola’s MI Bus is contained in the following Motorola publications:
EB409/D — The MI Bus and Product family for Multiplexing Systems
AN475/D — Single Wire MI Bus Controlling Stepper Motors
BR477/D — Smart Mover – Stepper Motors with Integrated Serial Bus Controller
Freescale Semiconductor, Inc.
For More Information On This Product,
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289
Push-pull sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .290
Biphase coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .291
Message validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
Interfacing to MI Bus. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
MI Bus clock rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
SCI0/MI Bus registers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296
Section 16. Motorola Interconnect Bus
Go to: www.freescale.com
Motorola Interconnect Bus
Technical Data
289
(1)
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