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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)： | 77/102頁 |
| 文件大?。?/td> | 700K |
| 代理商： | MC68HC58FN |
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MOTOROLA
CONTROL AND STATUS CODES
MC68HC58
5-10
TECHNICAL DATA
5.3.1.5 One Byte in Buffer
This value indicates that the RxFIFO buffer contains one byte that is not a completion
code.
5.3.1.6 Completion Code at Head of Buffer, More Bytes Available
This value indicates that there is a completion code at the head of the RxFIFO buffer,
and additional bytes but no additional completion codes are in the buffer.
5.3.1.7 Completion Code at Head of Buffer, Frame Available
This value indicates that there is a completion code at the head of the RxFIFO buffer,
and additional bytes and an additional completion code are in the buffer.
5.3.1.8 Completion Code Only at Head of Buffer
This value indicates that there is a completion code at the head of the RxFIFO buffer,
and no additional bytes are in the buffer. Indication usually occurs after execution of a
flush frame command.
5.3.2 DLI — Data Link Idle Bit
DLI is set when the J1850 bus is idle. DLI is cleared when the J1850 bus has been
active for longer than the digital filter time constant, or when an EOD symbol is being
timed by the receive logic. Once cleared, DLI does not go to logic level one until an
EOD symbol has been received. If the J1850 bus remains active for longer than the
minimum BREAK symbol definition, a completion code indicating a break has oc-
curred is placed in the RxFIFO buffer. A prolonged data link active indication may in-
dicate that the J1850 bus is shorted to 12 Vdc.
0 = SAE J1850 bus is active
1 = SAE J1850 bus is idle
5.3.3 NETF — Network Fault Bit
This value indicates the DLC J1850 bus connection is shorted to ground. When a hard-
ware fault prevents the DLC receiver from sensing an active state after the transmitter
has driven the J1850 bus for 60
s, NETF is set. After NETF is set, only an Abort
Transmission command or assertion of the DLC RST input can restart the DLC.
When the short is momentary, it is appropriate to try reloading and retransmission.
However, if the problem is a defective receiver, retransmission could corrupt another
frame.
0 = Active state occurred before 60
s
1 = Active state not sensed after 60
s
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相關代理商/技術參數(shù) |
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