mc68hc08ln56 Freescale Semiconductor, Inc, mc68hc08ln56 Datasheet - Page 147

• Manufacturer Part Number: mc68hc08ln56
• Description: M68hc08 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Slow Data Tolerance
Figure 12-9
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 per cent 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 per cent difference between the receiver count and the transmitter count of a slow 9-bit
character with no errors is
Fast Data Tolerance
Figure 12-10
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
MC68HC08LN56 • MC68HC708LN56 General Release Specification, Rev. 2.1
MSB
154 147
----------------------- -
170 163
----------------------- -
Figure
Figure
Figure 12-10. Fast Data
Figure 12-9. Slow Data
STOP
154
170
–
–
12-9, the receiver counts 154 RT cycles at the point when
12-9, the receiver counts 170 RT cycles at the point when
×
×
100
100
SAMPLES
SAMPLES
DATA
DATA
=
=
4.54%
4.12%
IDLE OR NEXT CHARACTER
STOP
Functional Description
147