MC68HC908AP16CFB datasheet(265/440 Pages) MOTOROLA

265 / 440 page

Infrared Serial Communications Interface Module (IRSCI)

SCI Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

265

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 14-10 shows how much a slow received character can be

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.

Figure 14-10. Slow Data

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 Figure 14-10, the receiver

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 Figure 14-10, the receiver

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.

MSB

STOP

DATA

SAMPLES

RECEIVER

RT CLOCK

154

147

–

154

--------------------------

100

4.54%

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 265 Page - Motorola, Inc

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