Enhanced Serial Communication Interface (eSCI)
PXN20 Microcontroller Reference Manual, Rev. 1
31-16 Freescale Semiconductor
The content and usage of the eSCI LIN TX Register (eSCI_LTR) depends on the transfer direction of
initiated frame. If the application initiates a TX frame transfer, i.e., the TD bit is set to 1, the content and
usage shown in eSCI LIN TX Register (eSCI_LTR) — TX Frame Generation register (Figure 31-10)
applies. If the application initiates an RX frame, i.e., the TD bit is set to 0, the content and usage shown in
eSCI LIN TX Register (eSCI_LTR) — RX Frame Generation register (Figure 31-11) applies.
The initiation and transmit of a TX frame is described in Section 31.4.6.3, LIN TX Frame Generation. The
initiation and transmit of a RX frame is described in Section 31.4.6.4, LIN RX Frame Generation.
NOTE
When the eSCI module is in LIN mode and transmits or receives a LIN
frame, if the CPU requests Stop Mode, and the Stop Mode is left, a
subsequent triggered LIN RX Frame reception may hang. The module will
never assert the eSCI_IFSR2[RXRDY] and eSCI_IFSR2[TXRDY] flags.
The application should ensure that no LIN transmission is running before it
requests Stop Mode by checking the status of the eSCI_IFSR1[TACT] and
eSCI_IFSR1[RACT] status flags.
Offset: ESCI_BASE + 0x0010 Access: User write-only
(TD = 1)
Byte
01234567
R
1st W P[1:0] ID[5:0]
2nd W LEN
3rd W CSM CSE CRC TD (= 1) TO (ignored)
4th+ W DATA
Reset00000000
Figure 31-10. eSCI LIN TX Register (eSCI_LTR) — TX Frame Generation
Offset: ESCI_BASE + 0x0010 Access: User write-only
(TD = 0)
Byte
01234567
R
1st W P[1:0] ID[5:0]
2nd W LEN
3rd W CSM CSE CRC TD (= 0) TO[11:8]
4th W TO[7:0]
Reset00000000
Figure 31-11. eSCI LIN TX Register (eSCI_LTR) — RX Frame Generation
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