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ST7MC1K2-Auto 数据表(PDF) 162 Page - STMicroelectronics |
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ST7MC1K2-Auto 数据表(HTML) 162 Page - STMicroelectronics |
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162 / 371 page  Obsolete Product(s) - Obsolete Product(s) On-chip peripherals ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto 162/371 Figure 66. LIN header The bits involved are the two MSB positions (7th and 8th bits if M = 0; 8th and 9th bits if M = 0) of the identifier character. The check is performed as specified in Figure 67 by the LIN specification. Figure 67. LIN identifier LIN error detection LIN header error flag The LIN header error flag indicates that an invalid LIN header has been detected. When a LIN header error occurs: ● The LHE flag is set. ● An interrupt is generated if the RIE bit is set and the I[1:0] bits are cleared in the CCR register. If autosynchronization is enabled (LASE bit = 1), this can mean that the LIN synch field is corrupted, and that the SCI is in a blocked state (LSF bit is set). The only way to recover is to reset the LSF bit and then to clear the LHE bit. ● The LHE bit is reset by an access to the SCISR register followed by a read of the SCIDR register. LHE/OVR error conditions When auto resynchronization is disabled (LASE bit = 0), the LHE flag detects the following: ● The received LIN synch field is not equal to 55h. ● An overrun has occurred (as in standard SCI mode). Furthermore, if LHDM is set it also detects that a LIN header reception timeout occurred (only if LHDM is set). LIN synch LIN synch Identifier Parity bits field field break Identifier field Parity bits ID0 Start bit Stop bit ID1 ID2 ID3 ID4 ID5 P0 P1 Identifier bits P1 ID1 ID3 ID4 ID5 ÝÝ Ý = P0 ID0 =ID1 ID2 ID4 ÝÝ Ý M=0 Obsolete Product(s) - Obsolete Product(s) |
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