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| 型號： | MSM6636GS-VK |
| 廠商： | OKI ELECTRIC INDUSTRY CO LTD |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 1 CHANNEL(S), 41.6K bps, LOCAL AREA NETWORK CONTROLLER, PDSO24 |
| 封裝： | 0.430 INCH, 1.27 PITCH, PLASTIC, SOP-24 |
| 文件頁數(shù)： | 61/70頁 |
| 文件大小： | 1115K |
| 代理商： | MSM6636GS-VK |
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MSM6636/6636B User’s Manual
Bus Monitor Function
8 – 1
8. BUS MONITOR FUNCTION
In ordinal operation mode of MSM6636/6636B, the message filtering function is based on physical or functional
address. Therefore the MSM6636/6636B treat only the message that is addressed to it and handle the message as
a communication frame.
However, when the bus monitor mode is set as explained below, all the messages on LAN can be received.
Using the bus monitor mode, monitor equipment to analyze the messages on J1850 network can be easily
designed.
(1) Bus Monitor Setting Method
a. Set the “D2, D1, D0” bits of the Mode Setting Register (2AH) to “1, 1, 1.”
D2
D1
D0
PB0
NB0
NAK
N1
N0
70
1
b. MSM6636:
Apply 4 pulses to M-N
MSM6636B: Apply 4 pulses to ALE pin (need to keep
CS pin = L level)
c. Resume the contents of “D2, D1, D0” to proper value that is depending on the applied oscillation
frequency.
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