MC9S12T64 Datasheet, PDF (447/608 Pages) Motorola, Inc – Specification

Freescale Semiconductor, Inc.
Serial Communications Interface (SCI)
Functional Description
bit time, the data samples RT8, RT9, and RT10 are within the bit time
and data recovery is successful.
RX Input Signal
PERCEIVED START BIT
ACTUAL START BIT
LSB
SAMPLES 1 1 1 0
0
1
0000
RT CLOCK
RT CLOCK COUNT
RESET RT CLOCK
Figure 83 Start Bit Search Example 3
Figure 84 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.
RX Input Signal
PERCEIVED AND ACTUAL START BIT
LSB
SAMPLES 1 1 1 1 1 1 1 1 1 0
1
0
RT CLOCK
RT CLOCK COUNT
RESET RT CLOCK
Figure 84 Start Bit Search Example 4
Figure 85 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
Serial Communications Interface (SCI)
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MC9S12T64Revision 1.1.1