MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 261
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MC68HC908LK24
Manufacturer Part Number
MC68HC908LK24
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908LK24.pdf
(465 pages)
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13.7.3.4 Framing Errors
13.7.3.5 Baud Rate Tolerance
MC68HC908LJ24/LK24 — Rev. 2
MOTOROLA
NOTE:
Infrared Serial Communications Interface Module (IRSCI)
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. The FE flag is set at the same time that the SCRF bit is set. A
break character that has no stop bit also sets the FE bit.
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
tolerance is much more than the degree of misalignment that is likely to
occur.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
RT8, RT9, and RT10
Table 13-4. Stop Bit Recovery
Samples
Table 13-4
000
001
010
011
100
101
110
111
Infrared Serial Communications Interface Module (IRSCI)
summarizes the results of the stop bit
Error Flag
Framing
1
1
1
0
1
0
0
0
Noise Flag
SCI Functional Description
0
1
1
1
1
1
1
0
Data Sheet
261
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