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參數資料
| 型號： | MC68HC705V8CFU |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP64 |
| 封裝： | QFP-64 |
| 文件頁數： | 28/172頁 |
| 文件大?。?/td> | 890K |
| 代理商： | MC68HC705V8CFU |
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MOTOROLA
SECTION 15: MESSAGE DATA LINK CONTROLLER
Page 112
MC68HC705V8 Specification Rev. 2.1
As long as the CPU has possession of the Tx Buffer, the MDLC cannot transmit. Once the
CPU has finished with the contents of the Tx Buffer, it may be "given back" to the MDLC by
writing the message body length ’n’ to the MDLC Tx Control Register (MTCR).
Starting from the first entry of the Tx Buffer, the MDLC fetches each data byte from a filled
entry of the Tx Buffer, the Tx Buffer pointer is incremented and the MDLC attempts to
transmit the data byte onto the J1850 bus. This continues until the last byte of the message
body has been fetched, arbitration is lost or an error occurs. If the transmitted message is
sent error-free then a CRC is appended, the filled Tx Buffer is given back to the CPU, the
Transmitted Message Successfully (TXMS) bit in the MDLC Status Register (MSR) is set,
and a CPU interrupt request is made (if interrupts are enabled). This sequence is then
repeated as long as normal data transmission takes place.
If any type of transmission error is detected by the MDLC as a message is being transmitted
onto the J1850 bus, the internal Tx Buffer pointer will be reset to zero, effectively flushing
the data to be sent, and the MDLC will automatically abort transmission. When this occurs
the MDLC will not generate a CPU interrupt request and will silently wait for the next write
to the MTCR register.
If a loss of arbitration occurs while the MDLC is attempting to transmit a message, the
MDLC will immediately halt transmission and become a receiver. As soon as an idle bus
condition is detected, the MDLC will again attempt to transmit the message onto the
multiplex bus. This automatic retry will continue until the message is transmitted
successfully, an error is detected during transmission, or the TXAB bit is set by the CPU.
Since the Tx Buffer is 11 bytes long, any value greater than or equal to $0C written to the
MTCR register will create a Tx Buffer overflow error and cause the MDLC to not transmit
that message. Attempts to send a zero byte message body length (value of $00 written to
MTCR) will also cause the MDLC to not transmit that message.
At the end of a transmission, successful, unsuccessful or aborted, the MTCR register is
automatically cleared. If interrupts are enabled, the programmer should not poll the MTCR
register to detect this action since each access will clear the TXMS bit in the MSR register!
Instead, since the MDLC receives every message that it sends, the programmer should
check that each message that is attempted to be sent is received back within some
acceptable amount of time before attempting to send another message. Failure to receive
back a message that has been sent in a timely fashion might indicate that some network
fault exists.
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For More Information On This Product,
Go to: www.freescale.com
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