參數(shù)資料
型號: MC68HC705X4
廠商: Motorola, Inc.
英文描述: HCMOS Microcontroller Unit
中文描述: HCMOS微控制器
文件頁數(shù): 90/156頁
文件大?。?/td> 926K
代理商: MC68HC705X4
Motorola CAN
MC68HC05X4
90
Motorola CAN
MOTOROLA
SYNC_SEG
this period.
System expects transitions to occur on the bus during
Transmit point A node in transmit mode will transfer a new value to the
MCAN bus at this point.
Sample point
If the three samples per bit option is selected then this point marks the
position of the third sample.
A node in receive mode will sample the bus at this point.
Time segment 1 (TSEG1) and time segment 2 (TSEG2) are
programmable as shown in
Table 3
.
The bit time is determined by the oscillator frequency, the baud rate
prescaler, and the number of bus clock cycles (
t
SCL
) per bit (as shown
above).
Figure 13. Segments within the bit time
TSEG 1
BIT_TIME
SYNC_SEG
TSEG 2
SYNC_SEG
1 clock cycle
t
SCL
Sample point
Transmit point
Transmit point
Table 3. Time segment values
TSEG13 TSEG12 TSEG11 TSEG10
0
0
0
0
0
0
.
.
.
.
1
1
Time segment 1
2 t
SCL
cycles
3 t
SCL
cycles
4 t
SCL
cycles
.
.
16 t
SCL
cycles
TSEG22 TSEG21 TSEG20
0
0
.
.
.
.
1
1
Time segment 2
2 t
SCL
cycles
.
.
8 t
SCL
cycles
0
1
1
.
.
1
1
0
1
.
.
1
1
.
.
1
22-mcan
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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