參數(shù)資料
型號: T89C51CC01
廠商: Atmel Corp.
英文描述: Enhanced 8-bit MCU with CAN controller and Flash
中文描述: 增強(qiáng)型8位微控制器的CAN控制器和Flash
文件頁數(shù): 91/170頁
文件大?。?/td> 1927K
代理商: T89C51CC01
91
A/T89C51CC01
4129L–CAN–08/05
Figure 48.
General Structure of a Bit Period
example of bit timing determination for CAN baudrate of 500kbit/s:
Fosc = 12 MHz in X1 mode => FCAN = 6 MHz
Verify that the CAN baud rate you want is an integer division of FCAN clock.
FCAN/CAN baudrate = 6 MHz/500 kHz = 12
The time quanta TQ must be comprised between 8 and 25: TQ = 12 and
BRP = 0
Define the various timing parameters: Tbit = Tsyns + Tprs + Tphs1 + Tphs2 =
12TQ
Tsyns = 1TQ and Tsjw =1TQ =>
SJW = 0
If we chose a sample point at 66.6% => Tphs2 = 4TQ =>
PHS2 = 3
Tbit = 12 = 4 + 1 + Tphs1 + Tprs, let us choose Tprs = 3 Tphs1 = 4
PHS1 = 3
and
PRS = 2
BRP = 0 so CANBT1 = 00h
SJW = 0 and PRS = 2 so CANBT2 = 04h
PHS2 = 3 and PHS1 = 3 so CANBT3 = 36h
Bit Rate Prescaler
oscillator
1/ Fcan
Tscl
system clock
one nominal bit
Tsyns (*)
Tprs
Sample Point
(*) Synchronization Segment: SYNS
Tsyns = 1xTscl (fixed)
Tbit
data
Tbit
Tsyns
Tprs
Tphs
1
Tphs
2
+
+
+
=
Tbit calculation:
Transmission Point
Tphs1 + Tsjw (3)
Tphs2 - Tsjw (4)
(1) Phase error
0
(2) Phase error
0
(3) Phase error > 0
(4) Phase error < 0
Tphs2 (2)
Tphs1 (1)
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