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參數(shù)資料
| 型號： | SAE81C91 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 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, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數(shù)： | 6/41頁 |
| 文件大?。?/td> | 521K |
| 代理商： | SAE81C91 |
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07Feb95@09:05h Intermediate Version
Semiconductor Group
13
SAE 81C90/91
Descriptor Registers
A descriptor register is available for each message object and contains the eleven bits of the
message identifier (ID.0 through ID.10), the remote-transmission-request bit (RTR) and the data
length code (DLC) of a message.
n = 0...15
Bit RTR determines the function of the corresponding message object when it is transmitted, and its
reaction on a received data frame or remote frame.
The table below summarizes the message object’s behaviour in the different cases.
Note: For the transmission of remote frames (RTR = 1) the data-length-code should be set to ‘0’.
DRnH
76543210
Address: XXH
ID.10
ID.9
ID.8
ID.7
ID.6
ID.5
ID.4
ID.3
Reset Value: UUH
rw
DRnL
76543210
Address: XXH
ID.2
ID.1
ID.0
RTR
DLC
Reset Value: UUH
rw
Bit(field)
Function
DLC
Data Length Code
Defines the number of data bytes of message n.
Defined values are 0000...1000, i.e. 0...8 bytes. Other values are not permitted.
RTR
Remote Transmission Request Bit
‘0’:
This message operates as a data frame.
‘1’:
This message operates as a remote frame.
Note: See description and table below.
ID.10-0
Identifier
Identifier associated with message n, controls the acceptance of received frames
and is inserted into transmitted frames.
RTR bit Object is transmitted
Matching Data Frame
received
Matching Remote Frame
received
’0’
(data
frame)
The message object is
transmitted as a standard
data frame.
The data frame is stored in
the message object.
The remote frame is
ignored.
’1’
(remote
frame)
The message object is
transmitted as a remote
frame (i.e. a request).
The data frame is ignored
and not stored.
The message object is sent
as a data frame.
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