PXR40RM Datasheet, PDF (967/1434 Pages) Freescale Semiconductor, Inc – PXR40 Microcontroller

Enhanced Serial Communication Interface (eSCI)
Table 26-33. Start Bit Noise Detection
[RS8, RS9, RS10]
000
001
010
100
011
101
110
111
Noise Detected
No
Yes
Yes
Yes
Yes
Yes
Yes
Yes
26.4.5.3.16 Data Bit Sampling
Receiver Input
DATA / STOP BIT
Sampled Value 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1
DATA
VOTING
RCLK
RSC 12 13 14 15 16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 2
sample counter wrap
data strobing
Figure 26-33. Data and Stop Bit Sampling and Strobing
sample counter wrap
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 26-34 summarizes the results of the data bit sample. The receiver
detects the number of data bit according to the selected frame format.
Table 26-34. Data Bit Sampling
[RS8, RS9, RS10]
000
001
010
100
011
101
110
111
Data Bit Value
0
0
0
0
1
1
1
1
Noise Detected
No
Yes
Yes
Yes
Yes
Yes
Yes
No
Freescale Semiconductor
PXR40 Microcontroller Reference Manual, Rev. 1
26-39