MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 255
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MC68HC908AB32
Manufacturer Part Number
MC68HC908AB32
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AB32.pdf
(392 pages)
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MC68HC908AB32
MOTOROLA
—
Rev. 1.0
tolerance is much more than the degree of misalignment that is likely to
occur.
As the receiver samples an incoming character, it resynchronizes the RT
clock on any valid falling edge within the character. Resynchronization
within characters corrects misalignments between transmitter bit times
and receiver bit times.
Slow Data Tolerance
Figure 15-7
misaligned without causing a noise error or a framing error. The slow
stop bit begins at RT8 instead of RT1 but arrives in time for the stop bit
data samples at RT8, RT9, and RT10.
For an 8-bit character, data sampling of the stop bit takes the receiver
9 bit times
With the misaligned character shown in
154 RT cycles at the point when the count of the transmitting device is
9 bit times
The maximum percent difference between the receiver count and the
transmitter count of a slow 8-bit character with no errors is
For a 9-bit character, data sampling of the stop bit takes the receiver
10 bit times
RECEIVER
RT CLOCK
Freescale Semiconductor, Inc.
Serial Communications Interface Module (SCI)
For More Information On This Product,
Go to: www.freescale.com
shows how much a slow received character can be
16 RT cycles + 10 RT cycles = 154 RT cycles.
16 RT cycles + 3 RT cycles = 147 RT cycles.
16 RT cycles + 10 RT cycles = 170 RT cycles.
MSB
154 147
------------------------- -
Figure 15-7. Slow Data
154
–
Serial Communications Interface Module (SCI)
100
SAMPLES
DATA
Figure
=
4.54%
15-7, the receiver counts
STOP
Functional Description
Technical Data
255
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