参数资料
型号: MSM6636GS-VK
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, PDSO24
封装: 0.430 INCH, 1.27 PITCH, PLASTIC, SOP-24
文件页数: 62/70页
文件大小: 1115K
代理商: MSM6636GS-VK
MSM6636/6636B User’s Manual
Bus Monitor Function
8 – 2
(2) Bus Monitor Using Method
The received messages should be retrieved by the master CPU from the MSM6636/6636B using the CPU
interface.
When the program uses interrupts, please use the following registers.
IRQ and IE flags are mapped into the following registers.
BUSY NOACK NRSP B-MON BRK
RSP
RCV
TR
23
IRQ (Interrupt Request Flag)
BUSY NOACK NRSP B-MON BRK
RSP
RCV
TR
26
IE (Interrupt Enable Flag)
(3) Notes for Using Bus Monitor
Bus Monitor mode operates as usual node. Only the difference is that address filtering function is
disabled to receive all messages. Therefore if the message is addressed to the monitor node, the node
may make response to the message.
To avoid making response as described above and make the node work as monitoring only, choose the
unused address and set the address to the Address Setting Register.
(4) Detailed Explanation for Bus Monitor
When the MSM6636/6636B enter the bus monitor mode, messages are sequentially stored in receive
registers, starting with the 3-byte header of a message that begins with SOF. The difference from the
normal receiving is that data is received together with CRC code. Messages are stored in receive registers
in the order of data, CRC, and response. Therefore, because a message is stored by one byte too much for
CRC code, the last byte is not stored in receive registers (15H to 1CH) if the message is equal to the
maximum frame length. However, the last byte is stored in the 3CH address in that case. Therefore, in
this case, read also the 3CH address, though the address is not used for the normal communication.
In addition, the bytes including CRC are stored in receive data length registers. Therefore, during the bus
monitor mode, check data referencing the above bytes, when reading the received data.
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