mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 411
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mc9s12hz256v2
Manufacturer Part Number
mc9s12hz256v2
Description
Hcs12 Microcontrollers
Manufacturer
Freescale Semiconductor, Inc
Datasheet
1.MC9S12HZ256V2.pdf
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In
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.
Figure 13-19
synchronization with the start bit time, it does set the noise flag.
Freescale Semiconductor
RT CLOCK COUNT
RT CLOCK COUNT
RESET RT CLOCK
RESET RT CLOCK
Figure
RT CLOCK
RT CLOCK
SAMPLES
SAMPLES
13-18, a large burst of noise is perceived as the beginning of a start bit, although the test sample
RXD
RXD
shows the effect of noise early in the start bit time. Although this noise does not affect proper
1
1
1
1
1
1
1
0
1
Figure 13-18. Start Bit Search Example 3
Figure 13-19. Start Bit Search Example 4
1
0
MC9S12HZ256 Data Sheet, Rev. 2.05
1
1
1
PERCEIVED START BIT
1
0
0
0
1
0
PERCEIVED AND ACTUAL START BIT
0
0
ACTUAL START BIT
Chapter 13 Serial Communication Interface (SCIV4)
LSB
LSB
411
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