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RM0319 датащи(PDF) 216 Page - STMicroelectronics

номер детали RM0319
подробное описание детали  SPEAr320S architecture and functionality
PDF  368 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

RM0319 датащи(HTML) 216 Page - STMicroelectronics

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Controller area network ports (CAN)
RM0319
216/368
Doc ID 022640 Rev 3
In this example, the concatenated bit time parameters are (2-1)3&(7-1)4&(1-1)2&(1-1)6, the
Bit Timing register is programmed to= 0x1600.
Example for Bit Timing at low Baudrate
In this example, the frequency of CAN_CLK is 2 MHz, BRP is 1, the bit rate is 100 KBits/s.
In this example, the concatenated bit time parameters are (4-1)3&(5-1)4&(4-1)2&(2-1)6, the
Bit Timing register is programmed to= 0x34C1.
tSync-Seg
100
ns
=
1 * tq
bit time
1000
ns
=
tSync-Seg + tTSeg1 + tTSeg2
tolerance for CAN_CLK
0.39
%
=
=
tq
1
µs
=
2 * tCAN_CLK
delay of bus driver
200
ns
delay of receiver circuit
80
ns
delay of bus line (40m)
220
ns
tProp
1µs
=
1 * tq
tSJW
4µs
=
4 * tq
tTSeg1
5µs
=
tProp + tSJW
tTSeg2
4
µs
=
Information Processing Time + 3 * tq
tSync-Seg
1µs
=
1 * tq
bit time
10
µs
=
tSync-Seg + tTSeg1 + tTSeg2
tolerance for CAN_CLK
1.58
%
=
=
min PB1 PB2
,
()
2x 13xbittime
PB2
–
()
------------------------------------------------------------
0.1
μs
2x 13x1
μs0.2μs
–
()
------------------------------------------------------
min PB1 PB2
,
()
2x 13xbittime
PB2
–
()
------------------------------------------------------------
4
μs
2x 13x10
μs4μs
–
()
----------------------------------------------------



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