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M-BUS SERIAL INTERFACE
M-Bus (Motorola Bus) is a two-wire, bidirectional serial bus which provides a simple, efficient way
for data exchange between devices. It is fully compatible with the I
bus minimizes the interconnection between devices and eliminates the need for address
decoders; resulting in less PCB traces and economic hardware structure. This bus is suitable for
applications requiring communications in a short distance among a number of devices. The
maximum data rate is 100Kbit/s. The maximum communication length and number of devices that
can be connected are limited by a maximum bus capacitance of 400pF.
The M-Bus system is a true multi-master bus, including arbitration to prevent data collision if two
or more masters intend to control the bus simultaneously. It may be used for rapid testing and
alignment of end products via external connections to an assembly-line computer.
6.1
M-Bus Interface Features
2
•
Compatible with I
C bus standard
•
Multi-master operation
•
32 software programmable 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, stop and acknowledge signals
•
Repeated START signal generation
•
Bus busy detection
MC68HC05T16
6
M-BUS SERIAL INTERFACE
2
C bus standard. This two-wire
MOTOROLA
6
TPG
6-1
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