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| 型號(hào)： | ST72361AR9TC |
| 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)： | 51/224頁(yè) |
| 文件大?。?/td> | 4821K |
| 代理商： | ST72361AR9TC |
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ST72361-Auto
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LINSCI
SERIAL COMMUNICATION INTERFACE (LIN Mode) (Cont’d)
10.7.9.7 LINSCI Clock Tolerance
LINSCI Clock Tolerance when unsynchronized
When LIN slaves are unsynchronized (meaning no
characters have been transmitted for a relatively
long time), the maximum tolerated deviation of the
LINSCI clock is +/-15%.
If the deviation is within this range then the LIN
Synch Break is detected properly when a new re-
ception occurs.
This is made possible by the fact that masters
send 13 low bits for the LIN Synch Break, which
can be interpreted as 11 low bits (13 bits -15% =
11.05) by a “fast” slave and then considered as a
LIN Synch Break. According to the LIN specifica-
tion, a LIN Synch Break is valid when its duration
is greater than tSBRKTS = 10. This means that the
LIN Synch Break must last at least 11 low bits.
Note: If the period desynchronization of the slave
is +15% (slave too slow), the character “00h”
which represents a sequence of 9 low bits must
not be interpreted as a break character (9 bits +
15% = 10.35). Consequently, a valid LIN Synch
break must last at least 11 low bits.
LINSCI Clock Tolerance when Synchronized
When synchronization has been performed, fol-
lowing reception of a LIN Synch Break, the LINS-
CI, in LIN mode, has the same clock deviation tol-
erance as in SCI mode, which is explained below:
During reception, each bit is oversampled 16
times. The mean of the 8th, 9th and 10th samples
is considered as the bit value.
Consequently, the clock frequency should not vary
more than 6/16 (37.5%) within one bit.
The sampling clock is resynchronized at each start
bit, so that when receiving 10 bits (one start bit, 1
data byte, 1 stop bit), the clock deviation should
not exceed 3.75%.
10.7.9.8 Clock Deviation Causes
The causes which contribute to the total deviation
are:
–DTRA: Deviation due to transmitter error.
Note: The transmitter can be either a master
or a slave (in case of a slave listening to the
response of another slave).
–DMEAS: Error due to the LIN Synch measure-
ment performed by the receiver.
–DQUANT: Error due to the baud rate quantiza-
tion of the receiver.
–DREC: Deviation of the local oscillator of the
receiver: This deviation can occur during the
reception of one complete LIN message as-
suming that the deviation has been compen-
sated at the beginning of the message.
–DTCL: Deviation due to the transmission line
(generally due to the transceivers)
All the deviations of the system should be added
and compared to the LINSCI clock tolerance:
DTRA + DMEAS +DQUANT + DREC + DTCL < 3.75%
Figure 86.Bit Sampling in Reception Mode
RDI LINE
Sample
clock
12345678910
11
12
13
14
15
16
sampled values
One bit time
6/16
7/16
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