Enhanced Serial Communication Interface (eSCI)
PXN20 Microcontroller Reference Manual, Rev. 1
31-38 Freescale Semiconductor
If the start bit verification was not successful, the receiver resumes the start bit qualification. If the start bit
verification was successful, the receiver continues sampling to perform noise detection on the samples at
RS8, RS9, and RS10. The results of the start bit noise detection is summarized in Table 31-30.
31.4.5.3.16 Data Bit Sampling
Figure 31-33. Data and Stop Bit Sampling and Strobing
To determine the value of a data bit and to detect noise, a two out of three majority voting is performed on
the samples RS8, RS9, and RS10. Table 31-31 summarizes the results of the data bit sample. The receiver
detects the number of data bit according to the selected frame format.
100 Yes Yes
011 No No
101 No No
110 No No
111 No No
Table 31-30. Start Bit Noise Detection
[RS8, RS9, RS10] Noise Detected
000 No
001 Yes
010 Yes
100 Yes
011 Yes
101 Yes
110 Yes
111 Yes
Table 31-29. Start Bit Verification (continued)Result
[RS3, RS5, RS7] Start Bit Verified Noise Detected
Sampled Value
RCLK
DATA / STOP BIT
Receiver Input
11
1
11000
00
0
0
2 3
RSC
4 5 6 7
0
8 9 10 11 12 13 14 15 16 1
00
DATA
VOTING
data strobing
01001000
2
sample counter wrap
112 13 14 15 16
sample counter wrap
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