XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 260

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

Serial Communications Interface (SCI)
Technical Data
260
Fast Data Tolerance
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
counts 154 RT cycles at the point when 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
counts 170 RT cycles at the point when 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
Figure 18-10
misaligned without causing a noise error 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.
RECEIVER
RT CLOCK
Serial Communications Interface (SCI)
shows how much a fast received character can be
154 147
------------------------- -
170 163
------------------------- -
Figure 18-10. Fast Data
154
170
STOP
–
–
×
×
100
100
SAMPLES
DATA
=
=
4.54%
4.12%
Figure
Figure
MC68HC908AZ60A — Rev 2.0
IDLE OR NEXT CHARACTER
18-9, the receiver
18-9, the receiver
MOTOROLA