mc68hc908gr8b Freescale Semiconductor, Inc, mc68hc908gr8b Datasheet - Page 140

• Manufacturer Part Number: mc68hc908gr8b
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Serial Communications Interface (SCI) Module
13.4.3.5 Baud Rate Tolerance
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.
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 13-8
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
+ 10 RT cycles = 154 RT cycles.
With the misaligned character shown in
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
+ 10 RT cycles = 170 RT cycles.
With the misaligned character shown in
the count of the transmitting device is 10 bit times
The maximum percent difference between the receiver count and the transmitter count of a slow 9-bit
character with no errors is
140
shows how much a slow received character can be misaligned without causing a noise error
RECEIVER
RT CLOCK
MC68HC908GR8B Data Sheet, Rev. 3.0
MSB
Figure
Figure
Figure 13-8. Slow Data
154 147
------------------------- -
170 163
------------------------- -
154
170
–
–
13-8, the receiver counts 154 RT cycles at the point when
13-8, the receiver counts 170 RT cycles at the point when
16 RT cycles + 3 RT cycles = 147 RT cycles.
100
100
16 RT cycles + 3 RT cycles = 163 RT cycles.
SAMPLES
DATA
=
=
4.54%
4.12%
STOP
Freescale Semiconductor
16 RT cycles
16 RT cycles