參數(shù)資料
型號(hào)： MSM9225BGA-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： PLASTIC, QFP-44
文件頁(yè)數(shù)： 22/95頁(yè)
文件大?。?/td> 567K
代理商： MSM9225BGA-2K
MSM9225B User’s Manual
Chapter 2 Register Descriptions
2 – 16
Notes on Identifier (ID) and Message Priority
Priority of message
A message has the priority determined by the identifier setting. To determine priority, identifiers of
messages are compared from the higher bit, and the identifier (set to “0”) detected first has the higher
priority (see the example below).
Identifier
Priority
00
1
11
01
0
1
Second
00
1
01
0
1
First
1
0
000
00
101
Fourth
00
1
001
01
101
Third
In this example, priority is determined at the shaded bits.
Figure 2-16 Message Priority
When same identifiers are set to multiple messages boxes
When same identifiers are set to multiple message boxes, operations are as follows:
1.
Transmit operation
Messages are transmitted sequentially from the smaller message box number.
2.
Receive operation
Data is always written to the message box with the smallest message box number, and never written
to other message boxes.
For example, if the same identifier is set at message box numbers 1 to 4, as shown in Figure 2-17,
operations are as follows:
Transmit operation
If every message box below is set for transmission, messages are transmitted sequentially in the
order of message box number 5
→ 0 → 6 → 1 → 2 → 3 → 4.
Receive operation
When the identifier “11100111001” is received from the CAN bus, received data is always written
to the message box which is indicated by the message box number 1.
Message box
Identifier
number
0
00
01
11
1
11
1
0
1
0
1
2
1
0
1
0
1
The range in which the same
3
1
0
1
0
1
identifier is set
4
1
0
1
0
1
5
0
00
0
11
1
6
1
00
0
01
1
Figure 2-17 Setting of the Same Identifier
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