MAC7200 datasheet(738/976 Pages) FREESCALE

Part #	MAC7200

Description	MAC7200 Microcontroller Family Reference Manual

PDF	976 Pages

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

Direct Link	http://www.freescale.com

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738 / 976 page

Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

660

Freescale Semiconductor

Figure 31-28. Start Bit Search Example

In Figure 31-29, verification sample at RT3 is high. The RT3 sample sets the noise flag. Although the

perceived bit time is misaligned, the data samples RT8, RT9, and RT10 are within the bit time and data

recovery is successful.

Figure 31-29. Start Bit Search Example 2

In Figure 31-30, a large burst of noise is perceived as the beginning of a start bit, although the test sample

at RT5 is high. The RT5 sample sets the noise flag. Although this is a worst-case misalignment of

perceived bit time, the data samples RT8, RT9, and RT10 are within the bit time and data recovery is

successful.

RESET RT CLOCK

SAMPLES

RT CLOCK

RT CLOCK COUNT

START BIT

Rx Input Signal

LSB

RESET RT CLOCK

SAMPLES

RT CLOCK

RT CLOCK COUNT

ACTUAL START BIT

Rx Input Signal

LSB

PERCEIVED START BIT

MAC7200 Datasheet(PDF) 738 Page - Freescale Semiconductor, Inc