MC9S12Q FREESCALE [Freescale Semiconductor, Inc], MC9S12Q Datasheet - Page 399

• Manufacturer Part Number: MC9S12Q
• Description: Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

In
not the beginning of a start bit. The RT clock is reset and the start bit search begins again. The noise flag
is not set because the noise occurred before the start bit was found.
In
perceived bit time is misaligned, the data samples RT8, RT9, and RT10 are within the bit time and data
recovery is successful.
Freescale Semiconductor
Figure 13-14
RT CLOCK COUNT
RT CLOCK COUNT
Figure
RESET RT CLOCK
RESET RT CLOCK
Rx Input Signal
Rx Input Signal
RT CLOCK
RT CLOCK
SAMPLES
SAMPLES
13-15, verification sample at RT3 is high. The RT3 sample sets the noise flag. Although the
the verification samples RT3 and RT5 determine that the first low detected was noise and
1
1
1
1
1
1
1
0
1
Figure 13-14. Start Bit Search Example 1
Figure 13-15. Start Bit Search Example 2
0
1
1
1
1
0
0
Chapter 13 Serial Communications Interface (S12SCIV2) Block Description
MC9S12Q128
PERCEIVED START BIT
Rev 1.09
0
0
0
0
0
ACTUAL START BIT
0
START BIT
0
0
0
0
LSB
LSB
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