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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： | 37/72页 |
| 文件大小： | 707K |
| 代理商： | MSM6636JS |
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MSM6636/6636B User’s Manual
Function Details
5 – 4
5.8 Communication Check Function between Multiple Nodes
This function checks whether communication between multiple nodes with their respective functional addresses
was normally made or not by sending messages with response type (K, Y, Z1, Z0) = (0, 0, 0, 0) or (0, 0, 1, 0)
(physical address & IFR type 2). How it is done is described below.
The multiple responders that normally received the message of the abovementioned response type send back ID
sequentially as in-frame responses, in which case the IDs are sent back in sequence from the responder with the
highest priority ID.
The returned IDs are then stored in the reception register in sequence from address 15H of the register. When all
the IDs have been stored, the interrupt request flags TR and RSP are set. The length of the received data is stored
in the reception data length register (address 20H). Therefore, by reading the reception data of the received data
length from the reception register and checking the IDs returned, the user can check whether the communication
between multiple nodes was normally made.
5.9 Break Function
The break function forcibly sets all nodes connected to LAN line to “receive enable state.”
By this function, the break transmission node can quickly carry out the message transmission operation by a break
transmission even during a bus busy state.
The break transmission is executed by writing “55H” to the break command register (29H).
Data on bus
Node (A)
Node (B)
BRK
EOD EOF IFS
SOF
Transmission stop
Timing in Node (A) Break Transmission during Node (B) Transmission
The following shows how the MSM6636/6636B operate when a break signal is received.
State at Break Reception
Operation
During transmission operation
Stops transmission operation (judges the contention loss generated
during communication).
The break interrupt flag is set.
Even though an auto-retransmission mode is set, the frame that
stopped the transmission by the break reception is canceled.
Therefore, the retransmission operation is not carried out.
During transmission standby such
as bus busy (in setting the auto-
retransmission mode)
Retransmission standby is canceled. Therefore, the retransmission
operation is not carried out, after break.
The break interrupt flag is set.
During reception operation
Stops the reception operation.
The message on response during reception is not stored in a reception
register.
The break interrupt flag is set.
During transmission standby
The break interrupt flag is set.
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