MC68HC705BD3 FREESCALE [Freescale Semiconductor, Inc], MC68HC705BD3 Datasheet - Page 47

• Manufacturer Part Number: MC68HC705BD3
• Description: High-density complementary metal oxide semiconductor (HCMOS) microcontroller unit
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

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.
7.1
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MC68HC05BD3
Compatible with I
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
M-Bus Interface Features
M-BUS SERIAL INTERFACE
2
C bus standard
M-BUS SERIAL INTERFACE
7
2
C bus standard. This two-wire
TPG
7-1
7