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| 型号： | MSM6636JS |
| 厂商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 1 CHANNEL(S), 41.6K bps, LOCAL AREA NETWORK CONTROLLER, PQCC18 |
| 封装： | 0.290 INCH, 1.27 MM PITCH, PLASTIC, QFJ-18 |
| 文件页数： | 38/72页 |
| 文件大小： | 707K |
| 代理商： | MSM6636JS |
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MSM6636/6636B User’s Manual
Function Details
5 – 5
5.10 Fault Tolerant Function
The following shows a detection flow in the case that BUS(+) and BUS(–) are short-circuited to V
DD and GND.
BUS(–)’s short circuit to GND
INT
BUS(–)’s short
circuit to GND
Bus input is
switched to
BUS(–) only.
INV, ABN,
and BNG flags
are set.
Clear processing
of INV, ABN,
and BNG flags
BNG flag is set.
Bus input is left
switched to
BUS(+) only.
Clear processing
of BNG flag
BUS(–) returns to normal status.
Bus input is switched to the
differential input of BUS(+)
and BUS(–).
BUS(–)
BUS(+)
48
s
Bus input is
switched to
BUS(+) only.
At a bus idle status, when BUS(–) is short-circuited to GND, because a bus that changes its status is preferentially
recognized as a normal bus, it is first judged that BUS(+) is short-circuited to GND and only BUS(–) is switched as
the reception input. If the BUS(–) is short-circuited to GND for more than 48 sec (in transmission speed 41.6
kbps setting), the dominant time error of the bus is detected and interrupt request flags ABN and INV are set. As
soon as these flags are set, it is rejudged that BUS(–) is short-circuited to GND, an interrupt request flag BNG is set,
and only BUS(+) input is switched as the reception input. Through the abovementioned flow, BUS(–)’s short
circuit to GND is detected and LAN bus input is switched so that normal communication can be carried out. Then,
three interrupt request flags (INV, ABN, and BNG) are set. When these flags are cleared, the operation after that is
just to set BNG flag. Next, when BUS(–) returns to the normal status, the inputs of both BUS(+) and BUS(–) are
switched as reception inputs and the reception status of a normal LAN bus is given as before. If BNG flag is then
cleared, all interrupt requests on LAN bus are cleared. When the disable setting bit (NB0) of LAN BUS output is
“0”, the LAN BUS(–) output is disabled when BNG flag is set and the LAN BUS(–) output is enabled when
BUS(–) returns to the normal status.
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