參數(shù)資料
型號： SJA1000
廠商： NXP SEMICONDUCTORS
元件分類： 微控制器/微處理器
英文描述： Stand-alone CAN controller(單機CAN控制器)
中文描述： 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PDIP28
封裝： 0.600 INCH, PLASTIC, DIP-28
文件頁數(shù)： 38/68頁
文件大?。?/td> 234K
代理商： SJA1000
2000 Jan 04
38
Philips Semiconductors
Product specification
Stand-alone CAN controller
SJA1000
Table 22
Bit interpretation of the error warning limit register (EWLR); CAN address 13
6.4.11
RX E
RROR
C
OUNTER
R
EGISTER
(RXERR)
The RX error counter register reflects the current value of the receive error counter. After a hardware reset this register
is initialized to logic 0. In operating mode this register appears to the CPU as a read only memory. A write access to this
register is possible only in reset mode.
If a bus-off event occurs, the RX error counter is initialized to logic 0. The time bus-off is valid, writing to this register has
no effect.
Note, that a CPU-forced content change of the RX error counter is only possible, if the reset mode was entered
previously. An error status change (see status register; Table 14), an error warning or an error passive interrupt forced
by the new register content will not occur, until the reset mode is cancelled again.
Table 23
Bit interpretation of the RX error counter register (RXERR); CAN address 14
6.4.12
TX E
RROR
C
OUNTER
R
EGISTER
(TXERR)
The TX error counter register reflects the current value of the transmit error counter.
In operating mode this register appears to the CPU as a read only memory. A write access to this register is possible
only in reset mode. After a hardware reset this register is initialized to logic 0. If a bus-off event occurs, the TX error
counter is initialized to 127 to count the minimum protocol-defined time (128 occurrences of the bus-free signal). Reading
the TX error counter during this time gives information about the status of the bus-off recovery.
If bus-off is active, a write access to TXERR in the range from 0 to 254 clears the bus-off flag and the controller will wait
for one occurrence of 11 consecutive recessive bits (bus-free) after the reset mode has been cleared.
Table 24
Bit interpretation of the TX error counter register (TXERR); CAN address 15
Writing 255 to TXERR allows to initiate a CPU-driven bus-off event. It should be noted that a CPU-forced content change
of the TX error counter is only possible, if the reset mode was entered previously. An error or bus status change (see
status register; Table 14), an error warning or an error passive interrupt forced by the new register content will not occur
until the reset mode is cancelled again. After leaving the reset mode, the new TX counter content is interpreted and the
bus-off event is performed in the same way, as if it was forced by a bus error event. That means, that the reset mode is
entered again, the TX error counter is initialized to 127, the RX counter is cleared and all concerned status and interrupt
register bits are set.
Clearing of reset mode now will perform the protocol-defined bus-off recovery sequence (waiting for 128 occurrences of
the bus-free signal).
If the reset mode is entered again before the end of bus-off recovery (TXERR > 0), bus-off keeps active and TXERR is
frozen.
BIT 7
EWL.7
BIT 6
EWL.6
BIT 5
EWL.5
BIT 4
EWL.4
BIT 3
EWL.3
BIT 2
EWL.2
BIT 1
EWL.1
BIT 0
EWL.0
BIT 7
RXERR.7
BIT 6
RXERR.6
BIT 5
RXERR.5
BIT 4
RXERR.4
BIT 3
RXERR.3
BIT 2
RXERR.2
BIT 1
RXERR.1
BIT 0
RXERR.0
BIT 7
TXERR.7
BIT 6
TXERR.6
BIT 5
TXERR.5
BIT 4
TXERR.4
BIT 3
TXERR.3
BIT 2
TXERR.2
BIT 1
TXERR.1
BIT 0
TXERR.0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SJA1000/N1,112 功能描述:網(wǎng)絡(luò)控制器與處理器 IC STAND-ALONE CAN CONTROLLER RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
SJA1000/N1112 制造商:NXP Semiconductors 功能描述:IC CAN CONTROLLER 1000 DIP28
SJA1000N 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Stand-alone CAN controller
SJA1000T 制造商:NXP Semiconductors 功能描述:
SJA1000T/N,112 功能描述:網(wǎng)絡(luò)控制器與處理器 IC STAND ALONE CAN CONTROLLER RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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