MC68HC11P2 Datasheet, PDF (109/268 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Technical Data — MC68HC11P2
Section 6. Motorola Interconnect Bus (MI BUS)
6.1 Contents
6.2 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
6.3 Push-pull sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
6.4 The push field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
6.5 The pull field . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
6.6 Biphase coding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
6.7 Message validation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
6.8 Interfacing to MI BUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
6.9 MI BUS clock rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
6.10 SCI/MI BUS2 registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
6.11 SCI/MI BUS3 registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123
6.2 Introduction
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 bit rate for the data transfer
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.⁽¹⁾
1. Related information on Motorola’s MI BUS is contained in the following Motorola publications:
MC68HC11P2 — Rev 1.0
Motorola Interconnect Bus (MI BUS)
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Technical Data