參數(shù)資料
型號： MC68HC705V8CFN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQCC68
封裝： PLASTIC, LCC-68
文件頁數(shù)： 32/172頁
文件大?。?/td> 615K
代理商： MC68HC705V8CFN
MOTOROLA
SECTION 15: MESSAGE DATA LINK CONTROLLER
Page 116
MC68HC705V8 Specification Rev. 2.1
15.4.3.5.6
Message Over Length Error
A Message Over Length error is detected when a message being received exceeds the
maximum length allowed for a message on the J1850 bus. If the Receive Block mode
(RXBM) bit is not set, the maximum received length from SOF to the EOD is 12 bytes
including the CRC byte. Any messages received with more than the maximum number of
bytes will be discarded by the MDLC.
15.4.3.5.7
Invalid Active Level
If the MDLC transmits an active symbol but senses that the bus remains active longer than
163 us, then the MDLC will stop transmitting. The MDLC will treat this invalid active level
just like a received Break symbol. The MDLC will try to transmit the message again after
an idle bus is detected.
15.4.3.5.8
BREAK - Break
Any MDLC transmitting at the time a BREAK is detected will treat the BREAK as if a loss
of arbitration had occurred, and halt transmission. The MDLC will then retry to transmit the
message.
If while receiving a message the MDLC detects a BREAK symbol, it will treat the BREAK
as a reception error and clear the current Rx Buffer pointer.
Table 15-3:
MDLC J1850 Bus Error Summary
Error Condition
MDLC Function
Bus short to VBATT.
The MDLC will not transmit until the bus is idle.
Bus short to Gnd.
The MDLC will try only once to send the message.
No interrupt will be generated.
MDLC
transmits
but
receives invalid bits (noise).
The MDLC will abort transmission immediately. No
interrupt will be generated.
MDLC receives invalid bit.
The MDLC will reset the Rx Buffer pointer and wait
for the next valid SOF. No interrupt will be generated.
MDLC
receives
message
framing error.
The MDLC will reset the Rx Buffer pointer and wait
for the next valid SOF. No interrupt will be generated.
MDLC receives under length
or over length message.
The MDLC will reset the Rx Buffer pointer and wait
for the next valid SOF. No interrupt will be generated.
MDLC receives invalid CRC
The MDLC will reset the Rx Buffer pointer and wait
for the next valid SOF. No interrupt will be generated.
MDLC
receives
BREAK
symbol
The MDLC will reset the Rx Buffer pointer and wait
for the next valid SOF. No interrupt will be generated.
MDLC sends an EOD but
receives an active symbol.
The MDLC will reset the Rx Buffer pointer and try to
resend that message after an idle bus.
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