MAC7200 datasheet(739/976 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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739 / 976 page

Functional Description

MAC7200 Microcontroller Family Reference Manual, Rev. 2

Freescale Semiconductor

661

Figure 31-30. Start Bit Search Example 3

Figure 31-31 shows the effect of noise early in the start bit time. Although this noise does not affect proper

synchronization with the start bit time, it does set the noise flag.

Figure 31-31. Start Bit Search Example 4

Figure 31-32 shows a burst of noise near the beginning of the start bit that resets the RT clock. The sample

after the reset is low but is not preceded by three high samples that would qualify as a falling edge.

Depending on the timing of the start bit search and on the data, the frame may be missed entirely or it may

set the framing error flag.

RESET RT CLOCK

SAMPLES

RT CLOCK

RT CLOCK COUNT

ACTUAL START BIT

Rx input Signal

LSB

PERCEIVED START BIT

RESET RT CLOCK

SAMPLES

RT CLOCK

RT CLOCK COUNT

PERCEIVED AND ACTUAL START BIT

Rx Input Signal

LSB

MAC7200 Datasheet(PDF) 739 Page - Freescale Semiconductor, Inc