參數(shù)資料
型號(hào)： ST72361AR6TA
廠商： STMICROELECTRONICS
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PQFP64
封裝： 10 X 10 MM, ROHS COMPLIANT, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 48/224頁(yè)
文件大?。?/td> 4821K
代理商： ST72361AR6TA
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ST72361-Auto
141/224
LINSCI
SERIAL COMMUNICATION INTERFACE (LIN Mode) (Cont’d)
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 de-
synchronized 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 = 39TBIT_MASTER pe-
riods.
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 + 10TBIT_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 head-
er Length (THEADER) through the LHL register.
This allows monitoring at software level the
TFRAME_MAX condition given by the LIN protocol.
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 discard-
ed. 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 a data
(which is not a break), it is discarded and the FE bit
is not set.
When LHDM bit = 1, any LIN header which re-
spects 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.
Figure 83. LIN Synch Field Measurement
LIN Synch Break
Extra
’1’
Bit0 Bit1 Bit2 Bit3 Bit4 Bit5 Bit6 Bit7
Start
Bit
Stop
Bit
Next
Start
Bit
LIN Synch Field
Measurement = 8.TBR = SM.tCPU
LPR(n)
LPR(n+1)
LPR = tBR / (16.tCPU) = Rounding (SM / 128)
tCPU = CPU period
tBR = Baud Rate period
tBR
tBR = 16.LP.tCPU
SM = Synch Measurement Register (15 bits)
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