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參數(shù)資料
| 型號： | MC68HC58DW |
| 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, PDSO28 |
| 封裝： | SOIC-28 |
| 文件頁數(shù)： | 73/102頁 |
| 文件大?。?/td> | 700K |
| 代理商： | MC68HC58DW |
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MOTOROLA
CONTROL AND STATUS CODES
MC68HC58
5-6
TECHNICAL DATA
5.1.2.7 Load as First and Last Byte of Frame
The “l(fā)oad as first and last byte of frame” command indicates that the accompanying
data byte is a one byte frame. After the byte is placed in the TxFIFO buffer for trans-
mission, the TMFS in the status byte is set to %11 (TxFIFO full).
If this command is latched while a previously loaded complete frame is in the buffer
awaiting transmission, the accompanying data byte will be discarded.
If this command is latched while a previously loaded complete frame is being transmit-
ted, the accompanying data byte will be discarded.
5.1.3 RFC[1:0] — Receive FIFO Command Field
Table 5-3 displays the RxFIFO commands.
5.1.3.1 Do Nothing
The “do nothing” command indicates to the DLC that an RxFIFO buffer command
should not be executed.
5.1.3.2 Flush Byte
The “flush byte” command flushes the first data byte or completion code in the RxFIFO
buffer. “Flush byte” commands cannot be queued. When there is nothing in the buffer,
no action is taken if a byte arrives after the command is latched. This is the only com-
mand that can flush a completion code.
5.1.3.3 Flush Frame
The “flush frame” command flushes the current frame except for the completion code
generated when the frame has been completely received. If interrupts are enabled
when a “flush frame” command is executed, the receiver will only generate an interrupt
request once the completion code is at the head of the RxFIFO.
When the RxFIFO buffer is flushed, it is not completely cleared, but cycled until the
first byte in the RxFIFO buffer is a completion code.
If the command is latched when a complete frame is in the buffer, the entire frame, ex-
cept for the completion code, is flushed.
If the command is latched when there is nothing in the buffer, the next frame, except
for the completion code, is flushed.
Table 5-3 RFC Field Encoding
Value
Description
00
Do nothing
01
Reserved
10
Flush byte or completion code
11
Flush frame except for completion code
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