參數(shù)資料
型號: P8xC592
廠商: NXP Semiconductors N.V.
英文描述: 8-bit microcontroller with on-chip CAN
中文描述: 8位微控制器芯片的CAN
文件頁數(shù): 43/108頁
文件大?。?/td> 650K
代理商: P8XC592
1996 Jun 27
43
Philips Semiconductors
Product specification
8-bit microcontroller with on-chip CAN
P8xC592
13.5.10 B
US
T
IMING
R
EGISTER
1(BTR1)
The contents of Bus Timing Register 1 defines the length
of the bit period, the location of the sample point and the
number of samples to be taken at each sample point.
This register can be accessed (read/write) if the Reset
Request bit is set HIGH (present).For further information
on bus timing, see Sections 13.5.9 and 13.5.18.
Table 47
Bus Timing Register 1 (address 7)
Table 48
Description of the BTR1 bits
7
6
5
4
3
2
1
0
SAM
TSEG2.2
TSEG2.1
TSEG2.0
TSEG1.3
TSEG1.2
TSEG1.1
TSEG1.0
BIT SYMBOL
FUNCTION
7
SAM
Sampling
. If the bit SAM is:
HIGH (3 samples), then three samples are taken. This is recommended for slow/medium speed
buses (SAE class A and B) where filtering of spikes on the bus-line is beneficial
(see Section 13.5.19.6)
LOW (1 sample), the bus is sampled once.
This is recommended for high speed buses (SAE class C).
TSEG2.2
Time Segment 1 (TSEG1) and Time Segment 2 (TSEG2)
.
TSEG1 determines the number of clock cycles per bit period and the location of the sample point
TSEG2.1
TSEG2.0
TSEG1.3
TSEG1.2
TSEG1.1
TSEG1.0
6
5
4
3
2
1
0
.
TSEG2 determines the number of clock cycles per bit period and the location of the sample point:
t
TSEG2
t
SCL
4TSEG2.2
2TSEG2.1
TSEG2.0
+
+
=
.
t
TSEG1
t
SCL
8TSEG1.3
4TSEG1.2
2TSEG1.1
TSEG1.0
1
+
+
+
+
(
)
=
1
+
(
)
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