mc68hc705e5 Freescale Semiconductor, Inc, mc68hc705e5 Datasheet - Page 74

• Manufacturer Part Number: mc68hc705e5
• Description: M68hc05 Family Of Microcontrollers Mcus
• Manufacturer: Freescale Semiconductor, Inc

Motorola Bus (M Bus) Interface
11.5.1 Start Signal
General Release Specification
START SIGNAL
START SIGNAL
SDA
SCL
SCL
SDA
MSB
MSB
1
1
1
1
Figure 11-1. M-Bus Transmission Signal Diagram
0
0
When the bus is free (for example, no master device is engaging the bus
and both SCL and SDA lines are at logical high), a master may initiate
communication by sending a start signal. As shown in
start signal is defined as a high-to-low transition of SDA while SCL is
high. This signal denotes the beginning of new data transfer (each data
transfer may contain several bytes of data) and wakes up all slaves.
0
0
Freescale Semiconductor, Inc.
0
0
For More Information On This Product,
0
0
Motorola Bus (M Bus) Interface
1
1
ACKNOWLEDGE BIT
Go to: www.freescale.com
ACKNOWLEDGE BIT
LSB
LSB
1
1
REPEATED START SIGNAL
MSB
MSB
1
1
1
1
0
0
0
0
0
0
0
0
MC68HC705E5
NO ACKNOWLEDGE
1
1
NO ACKNOWLEDGE
LSB
LSB
1
1
Figure
STOP SIGNAL
STOP SIGNAL
11-1, a
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Rev. 1.0