MC68HC908AP16CFB datasheet(263/440 Pages) MOTOROLA

263 / 440 page

Infrared Serial Communications Interface Module (IRSCI)

SCI Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

263

To locate the start bit, data recovery logic does an asynchronous search

for a logic 0 preceded by three logic 1s. When the falling edge of a

possible start bit occurs, the RT clock begins to count to 16.

To verify the start bit and to detect noise, data recovery logic takes

samples at RT3, RT5, and RT7. Table 14-2 summarizes the results of

the start bit verification samples.

If start bit verification is not successful, the RT clock is reset and a new

search for a start bit begins.

To determine the value of a data bit and to detect noise, recovery logic

takes samples at RT8, RT9, and RT10. Table 14-3 summarizes the

results of the data bit samples.

Table 14-2. Start Bit Verification

RT3, RT5, and RT7

Samples

Start Bit

Verification

Noise Flag

000

Yes

001

Yes

010

Yes

011

100

Yes

101

110

111

Table 14-3. Data Bit Recovery

RT8, RT9, and RT10

Samples

Data Bit

Determination

Noise Flag

000

001

010

011

100

101

110

111

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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