Datasheet

M-Bus Module
13-2 MCF5206e USER’S MANUAL MOTOROLA
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A block diagram of the complete M-Bus Module is shown in Figure 13-1.
13.3 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 these two signals must have open drain or open collector
outputs. The logic AND function is exercised on both lines with pullup resistors.
The default state of the M-Bus is as a slave receiver out of reset. Thus, when not
programmed to be a master or responding to a slave transmit address, the M-Bus should
always return to the default state of slave receiver.
Figure 13-1. M-Bus Module Block Diagram
ADDRESS
COMPARE
IN/OUT
DATA SHIFT
REGISTER
START, STOP, AND
ARBITRATION
CONTROL
INPUT
SYNC
CLOCK
CONTROL
REGISTERS AND COLDFIRE INTERFACE
ADDR_DECODE
CTRL_REG FREQ_REG ADDR_REG
STATUS_REG
DATA_REG
DATA_MUX
SDASCL
ADDR
IRQ
DATA
Fr
eescale S
emiconduct
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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