mc9s12hz256v2 Freescale Semiconductor, Inc, mc9s12hz256v2 Datasheet - Page 410

• Manufacturer Part Number: mc9s12hz256v2
• Description: Hcs12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Chapter 13 Serial Communication Interface (SCIV4)
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.
410
RT CLOCK COUNT
RT CLOCK COUNT
RESET RT CLOCK
RESET RT CLOCK
Figure 13-16
Figure
RT CLOCK
RT CLOCK
SAMPLES
SAMPLES
13-17, 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 13-16. Start Bit Search Example 1
Figure 13-17. Start Bit Search Example 2
1
0
MC9S12HZ256 Data Sheet, Rev. 2.05
1
1
1
0
0
PERCEIVED START BIT
0
0
0
0
0
ACTUAL START BIT
0
START BIT
0
0
0
0
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LSB
LSB