參數(shù)資料
型號(hào)： MSM9225GA-2K
廠商： OKI ELECTRIC INDUSTRY CO LTD
元件分類(lèi)： 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(yè)數(shù)： 56/74頁(yè)
文件大?。?/td> 487K
代理商： MSM9225GA-2K
Semiconductor
MSM9225
6/73
FUNCTIONAL DESCRIPTION
Data Memory
Before starting communication, messages for communication and various control registers
must be set at the data memory.
Addresses X0hex to XDhex are the message memory, which stores control registers, identifiers
and the contents of each message.
In this address space, the higher 4 bits of an address corresponds to the number of messages,
and a maximum of 16 (0Xhex to FXhex) can be stored. Each message has an area to store a
maximum of 8 bytes of data memory, 1 byte of control register, and a maximum of 5 bytes of
an identifier.
This means that the data memory capacity for messages is: 16 messages (8 bytes for a message
+ 1 byte for a control register + 5 bytes for an identifier) = 224 bytes.
Addresses XEhex to XFhex are allocated to the control registers.
The configuration of data memory is as follows
Data memory configuration
Address
Function
Message control register
Identifier 0
Identifier 1
Message 0
Identifier 2
Message 1
Identifier 3
Message 2
Identifier 4
Message 3
Message 0
Message 4
Message 1
Message 5
Message 2
Message 6
Message 3
Message 7
Message 4
—
Message 5
—
Message 6
—
Message 7
Various control registers
A7
A6
A5
A4
A3
A2
A1
A0
IDFM = 0 (standard)
IDFM = 1 (extended)
0000
0
Corresponds to
number of
messages
001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0000
1111
0000
1111
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