ST7MC1K2-Auto datasheet(164/371 Pages) STMICROELECTRONICS

164 / 371 page

Obsolete

Product(s)

- Obsolete

Product(s)

On-chip peripherals

ST7MC1K2-Auto, ST7MC1K6-Auto, ST7MC2S4-Auto, ST7MC2S6-Auto

164/371

The time-out counter is enabled at each break detection. It is stopped in the following

situations:

●

A LIN identifier field has been received

●

An LHE error occurred (other than a timeout error)

●

A software reset of LSF bit (transition from high to low) occurred during the analysis of

the LIN synch field

●

The LHE bit is set due to this error during the LIN synchr field (if LASE bit = 1) then the

SCI goes into a blocked state (LSF bit is set)

If LHE bit is set due to this error during fields other than LIN synch field or if LASE bit is reset

then the current received header is discarded and the SCI searches for a new break field.

Note on LIN header time-out limit

According to the LIN specification, the maximum length of a LIN header which does not

cause a timeout is equal to 1.4 * (34 + 1) = 49 TBIT_MASTER.

TBIT_MASTER refers to the master baud rate.

When checking this timeout, the slave node is desynchronized for the reception of the LIN

break and synch fields. Consequently, a margin must be allowed, taking into account the

worst case: This occurs when the LIN identifier lasts exactly 10 TBIT_MASTER periods. In this

case, the LIN break and synch fields last 49 - 10 = 39 TBIT_MASTER periods.

Assuming the slave measures these first 39 bits with a desynchronized clock of 15.5%. This

leads to a maximum allowed header length of:

39 x (1/0.845) TBIT_MASTER +10 TBIT_MASTER = 56.15 TBIT_SLAVE

A margin is provided so that the time-out occurs when the header length is greater than 57

TBIT_SLAVE periods. If it is less than or equal to 57 TBIT_SLAVE periods, then no timeout

occurs.

LIN header length

Even if no timeout occurs on the LIN header, it is possible to have access to the effective LIN

header length (THEADER) through the LHL register. This allows monitoring the TFRAME_MAX

condition given by the LIN protocol, at software level.

This feature is only available when LHDM bit = 1 or when LASE bit = 1.

Mute mode and errors

In mute mode when LHDM bit = 1, if an LHE error occurs during the analysis of the LIN

synch field or if a LIN header time-out occurs then the LHE bit is set but it does not wake up

from mute mode. In this case, the current header analysis is discarded. If needed, the

software has to reset LSF bit. Then the SCI searches for a new LIN header.

In mute mode, if a framing error occurs on data (which is not a break), it is discarded and the

FE bit is not set.

When LHDM bit = 1, any LIN header which respects the following conditions causes a

wake-up from mute mode:

●

A valid LIN break field (at least 11 dominant bits followed by a recessive bit).

●

A valid LIN synch field (without deviation error).

●

A LIN identifier field without framing error. Note that a LIN parity error on the LIN

identifier field does not prevent wake-up from mute mode.

●

No LIN header time-out should occur during header reception.

Obsolete

Product(s)

- Obsolete

Product(s)

ST7MC1K2-Auto 数据表(PDF) 164 Page - STMicroelectronics

ST7MC1K2-Auto 数据表(HTML) 164 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

ST7MC1K2-Auto 数据表(PDF) 164 Page - STMicroelectronics

ST7MC1K2-Auto 数据表(HTML) 164 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载