MC68HC908GT16_07 FREESCALE [Freescale Semiconductor, Inc], MC68HC908GT16_07 Datasheet - Page 159

• Manufacturer Part Number: MC68HC908GT16_07
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Slow Data Tolerance
Figure 14-8
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 × 16 RT cycles
+ 10 RT cycles = 154 RT cycles.
With the misaligned character shown in
the count of the transmitting device is 9 bit times × 16 RT cycles + 3 RT cycles = 147 RT cycles.
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 × 16 RT cycles
+ 10 RT cycles = 170 RT cycles.
With the misaligned character shown in
the count of the transmitting device is 10 bit times × 16 RT cycles + 3 RT cycles = 163 RT cycles.
The maximum percent difference between the receiver count and the transmitter count of a slow 9-bit
character with no errors is:
Fast Data Tolerance
Figure 14-9
or a framing error. The fast stop bit ends at RT10 instead of RT16 but is still there for the stop bit data
samples at RT8, RT9, and RT10.
Freescale Semiconductor
shows how much a slow received character can be misaligned without causing a noise error
shows how much a fast received character can be misaligned without causing a noise error
RECEIVER
RT CLOCK
RECEIVER
RT CLOCK
MC68HC908GT16 • MC68HC908GT8 • MC68HC08GT16 Data Sheet, Rev. 5.0
MSB
Figure
Figure
Figure 14-8. Slow Data
154 147
------------------------- -
170 163
------------------------- -
Figure 14-9. Fast Data
154
170
STOP
–
–
14-8, the receiver counts 154 RT cycles at the point when
14-8, the receiver counts 170 RT cycles at the point when
×
×
100
100
DATA SAMPLES
DATA SAMPLE
=
=
4.54%
4.12%
IDLE OR NEXT CHARACTER
STOP
Functional Description
159