MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 268
MC9S12E32CFU
Manufacturer Part Number
MC9S12E32CFU
Description
HCS12 Microcontrollers
Manufacturer
FREESCALE [Freescale Semiconductor, Inc]
Datasheet
1.MC9S12E32CFU.pdf
(606 pages)
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Chapter 8 Serial Communication Interface (SCIV3)
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.
268
RT CLOCK COUNT
RT CLOCK COUNT
RESET RT CLOCK
RESET RT CLOCK
Figure 8-16
Figure
RT CLOCK
RT CLOCK
SAMPLES
SAMPLES
8-17, verification sample at RT3 is high. The RT3 sample sets the noise flag. Although the
RXD
RXD
the verification samples RT3 and RT5 determine that the first low detected was noise and
1
1
1
1
1
1
0
1
1
Figure 8-16. Start Bit Search Example 1
Figure 8-17. Start Bit Search Example 2
1
0
MC9S12E128 Data Sheet, Rev. 1.07
1
1
1
0
0
PERCEIVED START BIT
0
0
0
0
0
ACTUAL START BIT
0
START BIT
0
0
0
0
Freescale Semiconductor
LSB
LSB
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