參數(shù)資料
型號(hào)： MC68HC58FN
廠商： MOTOROLA INC
元件分類： 微控制器/微處理器
英文描述： 1 CHANNEL(S), LOCAL AREA NETWORK CONTROLLER, PQCC28
封裝： PLASTIC, LCC-28
文件頁(yè)數(shù)： 78/102頁(yè)
文件大?。?/td> 700K
代理商： MC68HC58FN
MC68HC58
CONTROL AND STATUS CODES
MOTOROLA
TECHNICAL DATA
5-11
5.3.4 4XMD — 4X Mode Bit
This value indicates the DLC is operating in high-speed mode without waveshaping.
This mode is not used during normal operation.
0 = DLC operating in normal mode
1 = DLC operating at 41.67 kbps
5.3.5 TMFS[1:0] — TxFIFO Status Field
This bit field shows the status of TxFIFO buffer. Table 5-6 shows the TxFIFO status
encoding field.
5.3.5.1 Buffer Empty
This value indicates there are no data bytes in TxFIFO buffer.
5.3.5.2 Buffer Contains Data
This value indicates that the TxFIFO buffer contains one to nine bytes of data.
5.3.5.3 Buffer Almost Full
This value indicates that the TxFIFO buffer contains ten bytes of data.
5.3.5.4 Buffer Full
This value indicates that either the TxFIFO buffer contains 11 bytes of data (in block
transmission mode), or that it contains a byte that was accompanied by a “l(fā)ast byte”
command.
5.4 Completion Code Byte
When a frame is complete, after the time period for an EOD symbol has elapsed, the
DLC generates a completion code byte and transfers it to the host MCU in the same
way that a received data byte is transferred. The accompanying status byte indicates
that it is a completion code byte.
The completion code byte contains an error flag, transmitter action codes, IFR codes,
and error codes. When a DLC is transmitting, completion code information applies to
both transmitter and receiver.
Any activity on the J1850 bus longer than the digital filter time constant causes a com-
pletion code byte to be placed in the RxFIFO buffer after the J1850 bus is idle for an
EOD length of time.
Table 5-6 TMFS Field Encoding
Value
Description
00
Buffer empty
01
Buffer contains data bytes
10
Buffer almost full
11
Buffer full
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