HC705E5GRSSLASHD datasheet(73/148 Pages) NXP

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Motorola Bus (M Bus) Interface

M-Bus Interface Features

MC68HC705E5 — Rev. 1.0

General Release Specification

Motorola Bus (M Bus) Interface

11.3 M-Bus Interface Features

Features of the M-bus interface include:

•

Fully Compatible with I2C Bus Standard

•

Multimaster Operation

•

Software Programmable for 1of 32 Different Serial Clock

Frequencies

•

Software Selectable Acknowledge Bit

•

Interrupt Driven Byte-by-Byte Data Transfer

•

Arbitration Lost Driven Interrupt with Automatic Mode Switching

from Master to Slave

•

Calling Address Identification Interrupt

•

Generate/Detect the Start or Stop Signal

•

Repeated Start Signal Generation

•

Generate/Recognize the Acknowledge Bit

•

Bus Busy Detection

11.4 M-Bus System Configuration

The M-bus system uses a serial data line (SDA) and a serial clock line

(SCL) for data transfer. All devices connected to it must have open-drain

or open-collector outputs and the logical AND function is performed on

both lines by two pullup resistors.

11.5 M-Bus Protocol

Normally, a standard communication is composed of four parts: start

signal, slave address transmission, data transfer, and stop signal. These

are described briefly in the following subsections and illustrated in

Figure 11-1.

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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