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4.3.2
Data Transmission
Transmission frames are composed of two start bits, an 8-Bit or 10-bit data word, and error detection bit(s). Data words are
transmitted least-significant bit (LSB) first. A typical Manchester-encoded transmission frame is illustrated in Figure 30 .
Data Bit
SB1
SB0
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
PAR
SB1
I MOD
Bit Value
‘0’
‘0’
‘1’
‘1’
‘1’
‘0’
‘0’
‘1’
‘1’
‘1’
‘1’
‘0’
‘1’
t BIT
t TRAN = t BIT * (2+DATASIZE+(P_CRC?3:1))
t FRAME
Figure 30. Example Manchester Encoded Data Transfer - PSI5-x10P
4.3.3
Error Detection
Error detection of the transmitted data is accomplished via either a parity bit, or a 3-Bit CRC. The type of error detection used
is selected by the P_CRC bit in the DEVCFG register.
4.3.3.1
Parity Error Detection
When parity error detection is selected, even parity is employed. The number of logic ‘1’ bits in the transmitted message must
be an even number.
4.3.3.2
3-Bit CRC Error Detection
When CRC error detection is selected, a 3-bit CRC is appended to each response message. The 3-bit CRC uses a generator
polynomial of g(x) = X 3 +X+1, with a seed value = ‘111’. Data from the transmitted message is read into the CRC calculator LSB
first, and the data is augmented with three ‘0’s. Start bits are not used in the CRC calculation. Table 7 shows some example CRC
calculation values for 10-bit data transmissions.
Table 7. PSI5 3-Bit CRC Calculation Examples
Data Transmitted
CRC
HEX
0x000
0x0CC
0x151
0x1E0
0x1F4
0x220
0x275
0x333
0x3FF
D9
0
0
0
0
0
1
1
1
1
D8
0
0
1
1
1
0
0
1
1
D7
0
1
0
1
1
0
0
0
1
D6
0
1
1
1
1
0
1
0
1
D5
0
0
0
1
1
1
1
1
1
D4
0
0
1
0
1
0
1
1
1
D3
0
1
0
0
0
0
0
0
1
D2
0
1
0
0
1
0
1
0
1
D1
0
0
0
0
0
0
0
1
1
D0
0
0
1
0
0
0
1
1
1
C2
1
0
0
0
0
1
1
0
1
C1
1
1
0
1
1
0
1
0
0
C0
0
1
0
1
0
0
1
1
0
MMA52xxKW
Sensors
36
Freescale Semiconductor, Inc.
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