MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
21-18
Freescale Semiconductor
21.3.3.8
LIN CRC Polynomial Register (ESCIx_LPR)
ESCI
x
_LPR
n
can be written when there are no ongoing transmissions.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
D7
D6 D5
D4
D3
D2
D1
D0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0014
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0014
Figure 21-9. LIN Receive Register (ESCIx_LRR)
Table 21-13. ESCIx_LRR Field Descriptions
Bits
Name
Description
0–7
Dn
Data bit n. Provides received data bytes from RX frames. Data is only valid when the
ESCIx_SR[RXRDY] flag is set. CRC and checksum information will not be available in the
ESCIx_LRR unless they are treated as data. It is possible to treat CRC and checksum
bytes as data by deactivating the CSUM respectively CRC control bits in the ESCIx_LTR;
however, then CRC and CSUM checking has to be performed by software.
Data bytes must be read from the ESCIx_LRR (by CPU or DMA) before any new bytes
(including CRC or checksum) are received from the LIN bus otherwise the data byte is lost
and OVFL is set.
Note: The data must be collected and the LIN frame finished (including CRC and
checksum if applicable) before a wake-up character can be sent.
8–31
—
Reserved.
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
R
P15
P14
P13
P12
P11
P10
P9
P8
P7
P6
P5
P4
P3
P2
P1
P0
W
Reset
1
1
0
0
0
1
0
1
1
0
0
1
1
0
0
1
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
R
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
W
Reset
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Reg Addr
Base + 0x0018
Figure 21-10. LIN CRC Polynomial Register (ESCIx_LPR)
Summary of Contents for MPC5553
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