參數(shù)資料
型號： MSM9225GA-2K
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類： 微控制器/微處理器
英文描述： 2 CHANNEL(S), 1M bps, LOCAL AREA NETWORK CONTROLLER, PQFP44
封裝： 9 X 10 MM, 0.80 MM PITCH, PLASTIC, QFP-44
文件頁數(shù)： 67/74頁
文件大小： 487K
代理商： MSM9225GA-2K
Semiconductor
MSM9225
7/73
Message Memory
The message memory stores messages to be transmitted/received.
For transmission, only messages stored in the message memory can be transmitted. A message
with the highest priority among messages requested for transmission is sent.
For receiving, only messages that have an identifier stored in the message memory can be
received. When a message is received normally, and its identifier matches with the identifier
stored in the message memory, data of the received message is written to the message area of
the corresponding message in the message memory.
The message memory can store a maximum of 16 messages. Set messages at the NMES register.
1. Inside message control register (X0hex)
This register performs various controls for a message.
Set this register for each message.
The bit configuration is as follows:
76543210
Address MSB
0h
LSB
ARES : Automatic transmission
FRM : Message format setting
EIT : Transmission completion interrupt enable
EIR : Receive completion interrupt enable
RCS : Receive status
TRQ : Transmission request
Not used
MMA : Message memory access enable
(1) Message memory access request/enable bit: MMA
This bit prevents contention between the microcontroller and CAN when accessing the
message memory.
When the microcontroller accesses the message memory, "1" is written to the MMA bit
regularly. The microcontroller confirms that the MMA bit is "1", and then accesses the
message memory. Write "0" to the MMA bit when the microcontroller accessing ends.
Operations by the MMA bit are shown in the following table.
At reset, the MMA bit is set to "0".
MMA
0
1
Accesses from microcontroller
to message memory are disabled
Accesses from microcontroller
to message memory are enabled
Operate
Reading of received data
Reception
Stop
Rewriting of control area
Operate
Transmission
Stop
Rewriting of control area
Rewriting of transmission data
Microcontroller
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