mc68hc908jb16 Freescale Semiconductor, Inc, mc68hc908jb16 Datasheet - Page 222
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mc68hc908jb16
Manufacturer Part Number
mc68hc908jb16
Description
M68hc08 Microcontrollers Microcontroller
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC68HC908JB16.pdf
(332 pages)
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Serial Communications Interface
12.5.3.4 Framing Errors
12.5.3.5 Baud Rate Tolerance
Technical Data
222
NOTE:
The RT8, RT9, and RT10 samples do not affect start bit verification. If
any or all of the RT8, RT9, and RT10 start bit samples are logic 1s
following a successful start bit verification, the noise flag (NF) is set and
the receiver assumes that the bit is a start bit.
To verify a stop bit and to detect noise, recovery logic takes samples at
RT8, RT9, and RT10.
samples.
If the data recovery logic does not detect a logic 1 where the stop bit
should be in an incoming character, it sets the framing error bit, FE, in
SCS1. A break character also sets the FE bit because a break character
has no stop bit. The FE bit is set at the same time that the SCRF bit is
set.
A transmitting device may be operating at a baud rate below or above
the receiver baud rate. Accumulated bit time misalignment can cause
one of the three stop bit data samples to fall outside the actual stop bit.
Then a noise error occurs. If more than one of the samples is outside the
stop bit, a framing error occurs. In most applications, the baud rate
Serial Communications Interface Module (SCI)
RT8, RT9, and RT10
Samples
000
001
010
011
100
101
110
111
Table 12-4. Stop Bit Recovery
Table 12-4
summarizes the results of the stop bit
Error Flag
Framing
1
1
1
0
1
0
0
0
MC68HC908JB16
Freescale Semiconductor
Noise Flag
0
1
1
1
1
1
1
0
—
Rev. 1.1
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