XC886/888CLM
Serial Interfaces
User’s Manual
12-27
V1.3, 2010-02
Serial Interfaces, V 1.0
Figure 12-7
The Structure of Byte Field
The break is used to signal the beginning of a new frame. It is the only field that does not
comply with
. A break is always generated by the master task (in the master
mode) and it must be at least 13 bits of dominant value, including the start bit, followed
by a break delimiter, as shown in
. The break delimiter will be at least one
nominal bit time long.
A slave node will use a break detection threshold of 11 nominal bit times.
Figure 12-8
The Break Field
Synch Byte is a specific pattern for determination of time base. The byte field is with the
data value 55
H
A slave task is always able to detect the Break/Synch sequence, even if it expects a byte
field (assuming the byte fields are separated from each other). If this happens, detection
of the Break/Synch sequence will abort the transfer in progress and processing of the
new frame will commence.
Figure 12-9
The Synch Byte Field
LSB
(bit 0)
Start
Bit
Stop
Bit
MSB
(bit 7)
Byte field
Start
Bit
Break
delimit
Start
Bit
Stop
Bit
*
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