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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)： | 41/74頁(yè) |
| 文件大?。?/td> | 487K |
| 代理商： | MSM9225GA-2K |
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Semiconductor
MSM9225
46/73
PROTOCOL
The CAN (Controller Area Network) is a high-speed multiplexed communication protocol
designed to perform real-time communication inside an automobile. CAN specifications are
broadly classified into two layers, the physical layer and the data link layer. The data link layer
consists of logical link control and medium access control.
The configuration of each layer is listed below.
Application layer (not including object)
Data link layer
Logical link control (LLC): message and status handling
Medium access control (MAC): as per protocol
Physical layer: signal level and bit representation
Upper
Lower
Protocol Mode Function
(1) Standard format mode
2032 types of identifiers can be set in this mode.
Since the identifier is 11 bits, 2032 types of messages can be handled.
(2) Extended format mode
2032 218 types of identifiers can be set in this mode.
In the standard format mode, the identifier is 11 bits. However, in the extended format mode,
the identifier is extended to 29 bits (11 + 18).
If the SRR and IDE bits of the arbitration field are both "recessive", the mode changes to the
extended format mode.
If remote frames for an extended format mode message and a standard format message are
transmit simultaneously, the node that transmit the extended format message will change to
the receive state.
Message Format
CAN protocol messages have the following 4 types of frames.
(1) Data frame
: transmit data frame
(2) Remote frame
: transmit request frame from the receive side
(3) Error frame
: frame that is output when an error is detected
(4) Overload frame : frame that is output when the receive side has not completed preparing
for reception
*
In a wired-OR logic circuit, the stronger value is defined as "dominant" and the weaker value
as "recessive". In figures hereafter, dominant (abbreviation: D) = 0, and recessive (abbreviation:
R) = 1.
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