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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： | 62/72页 |
| 文件大小： | 707K |
| 代理商： | MSM6636JS |
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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 frequency division select code “D2, D1, D0” bits of the Mode Setting Register (2AH) to “1, 1,
1” .
D2
D1
D0
PB0
NB0
NAK
N1
N0
MSB
LSB
2A
Frequency division ratio setting (D2 to D0)
b) MSM6636:
Apply 4 pulses to M-N
MSM6636B: Apply 4 pulses to ALE pin (when “L” level is input to
CS pin)
The following figure shows the bus monitor setting timing of the MSM6636B.
c) Resume the contents of “D2, D1, D0” to proper value that is depending on the applied oscillation
frequency.
MSM6636B bus monitor setting timing
CS
AD0-7
ALE
WR
(a)
(b)
(c)
Set the frequency division select
code to “1, 1, 1”.
Reset the frequency division select
code to the specified code.
Data
Address
Data
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