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参数资料
| 型号： | MC68HC05V7CFNR2 |
| 厂商： | MOTOROLA INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PQCC68 |
| 封装： | PLASTIC, LCC-68 |
| 文件页数： | 15/170页 |
| 文件大小： | 589K |
| 代理商： | MC68HC05V7CFNR2 |
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SECTION 15: MESSAGE DATA LINK CONTROLLER
MOTOROLA
Page 97
MC68HC05V7 Specification Rev. 1.0
If this command is recognized by the MDLC while one of the first seven bits of a byte is
being transmitted (non-byte boundary) then the transmission of the bit will be completed
and no further bits will be sent.
If this command is recognized while the last bit of a byte is being transmitted (byte
boundary) then the transmission of the bit will first be completed. In order to avoid receiving
nodes from interpreting the aborted transmission at a byte boundary as being the end of a
normal message, the MDLC will then send two extra logic one bits.
This guarantees that no aborted message will be an integral number of bytes in length and
cannot be mistaken for a valid transmission.
Arbitration will be performed on any extra bits sent, allowing any other nodes which are also
transmitting to continue. Should the MDLC lose arbitration during the first extra logic one
sent, the second extra logic one will not be sent and no further attempts to send the
message will be made.
If this command is recognized after a write to the MDLC Transmit Control Register (MTCR),
thus initiating a transmission, but before the message has begun to be sent on the J1850
bus, then no attempt to transmit that message will be made until a subsequent write to the
MTCR is made.
If this command is recognized between automatic transmission retry attempts, such as
those following a loss of arbitration, all further attempts to resend the message will be
suppressed.
This bit is automatically cleared after the abort takes place or after it is determined that the
MDLC was not transmitting anyway. Refer to Table 15-1:
Function Summary for a summary of the operation of the TXAB bit.
The programmer must never write to the MTCR register while the TXAB bit is set, as this
may have unpredictable results.
Table 15-1:
MDLC Transmit Abort Function Summary
Transmit Abort Command
MDLC Action
Command recognized on
non-byte boundary
MDLC will terminate transmission immediately
Command recognized on
byte boundary
MDLC will transmit up to two extra ones
Command recognized
before the message has
started on the J1850 bus
MDLC will not transmit the message
Command recognized
during retry
MDLC will not retry to transmit the message
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