參數(shù)資料
型號(hào)： COP885BC
廠商： National Semiconductor Corporation
英文描述： 8-Bit CMOS ROM Based Microcontrollers with 2k Memory, Comparators, and CAN Interface(8位基于CMOS ROM帶2K存儲(chǔ)器，比較器和CAN接口的微控制器)
中文描述： 8位的CMOS基于ROM與2K內(nèi)存，比較器和CAN接口（8位基于ROM的帶2K的CMOS存儲(chǔ)器，比較器和CAN微控制器接口的微控制器）
文件頁(yè)數(shù)： 36/57頁(yè)
文件大?。?/td> 677K
代理商： COP885BC
Frame Formats
(Continued)
If only one device is on the bus and this device transmits
a message, it will get no acknowledgment. This will be
detected as an error and message will be repeated.
When the device goes “error passive” and detects an ac-
knowledge error, the TEC counter is not incremented.
Therefore the device will not go from “error passive” to
the “bus off” state due to such a condition.
Figure 30 shows the connection of different bus states ac-
cording to the error counters.
SYNCHRONIZATION
Every receiver starts with a “hard synchronization” on the
falling edge of the SOF bit. One bit time consists of four bit
segments: Synchronization segment, propagation segment,
phase segment 1 and phase segment 2.
A falling edge of the data signal should be in the synchroni-
zation segment. This segment has the fixed length of one
time quanta. To compensate for the various delays within a
network, the propagation segment is used. Its length is pro-
grammable from 1 to 8 time quanta. Phase segment 1 and
phase segment 2 are used to resynchronize during an active
frame. The length of these segments is from 1 to 8 time
quanta long.
Two types of synchronization are supported:
Hard synchronization
is done with the falling edge on the
bus while the bus is idle, which is then interpreted as the
SOF. It restarts the internal logic.
Soft synchronization
is used to lengthen or shorten the bit
time while a data or remote frame is received. Whenever a
falling edge is detected in the propagation segment or in
phase segment 1, the segment is lengthened by a specific
value, the resynchronization jump width (see Figure 32).
If a falling edge lies in the phase segment 2 (as shown in Fig-
ure 32) it is shortened by the resynchronization jump width.
Only one resynchronization is allowed during one bit time.
The sample point lies between the two phase segments and
is the point where the received data is supposed to be valid.
The transmission point lies at the end of phase segment 2 to
start a new bit time with the synchronization segment.
Note 16:
The resynchronization jump width (RJW) is automatically deter-
mined from the programmed value of PS. If a soft resynchronization is done
during phase segment 1 or the propagation segment, then RJW will either be
equal to 4 internal CAN clocks (CKI/(1 + divider)) or the programmed value of
PS, whichever is less. PS2 will never be shorter than 1 internal CAN clock.
Note 17:
(PS1—BTL settings any PSC setting) The PS1 of the BTL should
always be programmed to values greater than 1. To allow device resynchro-
nization for positive and negative phase errors on the bus. (if PS1 is pro-
grammed to one, a bit time could only be lengthened and never shortened
which basically disables half of the synchronization).
DS012067-65
FIGURE 30. CAN Bus States
DS012067-66
A) Synchronization segment
B) Propagation segment
FIGURE 31. Bit Timing
C
www.national.com
36
相關(guān)PDF資料
PDF描述
COP884CF 8-Bit CMOS ROM Based Microcontrollers with 4k Memory and A/D Converter
COP884CG Dual Low-Voltage Rail-to-Rail Output Operational Amplifier 8-MSOP -40 to 125
COP884CS Dual Low-Voltage Rail-to-Rail Output Operational Amplifier 8-SOIC -40 to 125
COP884EG Dual Low-Voltage Rail-to-Rail Output Operational Amplifier 8-SOIC -40 to 125
COP884EK Dual Low-Voltage Rail-to-Rail Output Operational Amplifier 8-TSSOP -40 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
COP885BC-XXX/WM 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
COP888CF 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8-Bit CMOS ROM Based Microcontrollers with 4k Memory and A/D Converter
COP888CFMHD-1 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
COP888CFMHD-3 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
COP888CFMHEL-1 制造商:未知廠家 制造商全稱:未知廠家 功能描述:8-Bit Microcontroller
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*