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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 68/102頁 |
| 文件大小： | 700K |
| 代理商： | MC68HC58FN |
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MOTOROLA
CONTROL AND STATUS CODES
MC68HC58
5-2
TECHNICAL DATA
5.1.1.1 Do Nothing
The “do nothing” command indicates to the DLC that a general command should not
be executed.
5.1.1.2 Enter Standby Mode
The “enter standby mode” command causes the DLC to operate in low power con-
sumption (standby) mode.
If the J1850 bus is not idle when this command is latched, the DLC becomes inactive
within 5
s after the J1850 bus goes idle.
If the J1850 bus is idle when this command is latched, the DLC goes into standby
mode immediately.
Toggling the CS line after this command has been latched, but before the DLC has
entered standby mode, clears the command.
5.1.1.3 Send BREAK Symbol
When the “send BREAK symbol” command is latched in, the DLC immediately sends
a BREAK symbol on the J1850 bus, regardless of current status of the transmitter.
5.1.1.4 Send IFR on EOD with CRC
The “send IFR on EOD with CRC” command causes the DLC to clear the transmitter
and the TxFIFO buffer, terminate automatic frame retry, and originate an IFR with a
CRC. This command must accompany a data byte, and the command BTAD field must
indicate either “l(fā)oad as first byte of transmit data” or “l(fā)oad as first and last byte of trans-
mit data”. The subsequent bytes in the same IFR must not be accompanied by this
command.
If this command is latched after an EOD has already occurred, the IFR is not transmit-
ted, and is lost. When this occurs, the DLC status byte indicates that the TxFIFO buffer
is empty, and the DLC does not terminate automatic retry.
Table 5-1 General Command Summary
Value
Description
000
Do nothing
001
Enter standby mode
010
Send BREAK symbol
011
Send IFR on EOD with CRC
100
Terminate automatic retry
101
Send IFR on EOD without CRC
110
Reserved
111
Abort transmission
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