參數(shù)資料
型號(hào)： DS80C390
英文描述： Dual CAN High-Speed Microprocessor
中文描述： 雙CAN高速微處理器
文件頁(yè)數(shù)： 30/58頁(yè)
文件大小： 5486K
代理商： DS80C390
DS80C390
30 of 58
110199
compared directly or via a mask register. A special set of arbitration registers dedicated to Message
center 15 allow added flexibility in filtering this location.
If desired, further arbitration can be performed by comparing the first two bytes of the data field in each
message against two 8-bit Media Arbitration register bytes. The MDME bit in the CAN Message Center
Format Registers (C0MxF.0 or C1MxF.0) either disables (MDME=0) arbitration, or enables (MDME=1)
arbitration using the Media ID Mask Registers 0-1.
If the 11-bit or 29-bit arbitration and the optional Media Byte arbitration are successful the message is
loaded into the respective message center. The Format Register also allows the microcontroller to
program each message center to function in a receive or transmit mode via the T/ R bit and to use from 0
to 8 data bytes within the data field of a message. Note that Message Center 15 can only be used in a
receive mode. To avoid a priority inversion the DS80C390 CAN processors are configured to reload the
transmit buffer with the message of the highest priority (lowest message center number) whenever an
arbitration is lost or an error condition occurs.
ARBITRATION/MASKING FEATURE SUMMARY
Table 13
Test Name
Arbitration Registers
Mask Registers
Standard Global Mask
Registers 0-1
(Located in each CAN
Control/Status/Mask
Register bank, MOVX
memory)
Extended Global Mask
Registers 0-3
(Located in each CAN
Control/Status/Mask
Register bank, MOVX
memory)
Media ID Mask Registers
0-1
(Located in each CAN
Control/Status/Mask
Register bank, MOVX
memory)
Control bits and conditions
Standard 11-bit
arbitration (CAN 2.0A)
Message Center
Arbitration Registers 0-1
(Located in each Message
Center, MOVX memory)
EX/ST =0
MEME=0: Mask register ignored. ID and
arbitration register must match exactly.
MEME=1: Only bits corresponding to 1 in mask
register are compared in ID and arbitration registers.
Extended 29-bit
arbitration (CAN 2.0B)
Message Center
Arbitration Registers 0-3
(Located in each Message
Center, MOVX memory)
EX/ST =1
MEME=0: Mask register ignored. ID and
arbitration register must match exactly.
MEME=1: Only bits corresponding to 1 in mask
register are compared in ID and arbitration registers.
Media byte arbitration
Media Arbitration
Registers 0-3
(Located in each CAN
Control/Status/Mask
Register bank, MOVX
memory)
MDME=0: Media byte arbitration disabled.
MDME =1: Only bits corresponding to 1 in Media
ID mask register are compared between data bytes 1
and 2 and Media arbitration registers.
Message Center 15,
Standard 11-bit
arbitration (CAN 2.0A)
Message Center 15
Arbitration Registers 0-1
(Located in Message
Center 15, MOVX
memory)
Message Center 15 Mask
Registers 0-1
(Located in each CAN
Control/Status/Mask
Register bank, MOVX
memory)
EX/ST =0
MEME=0: Mask register ignored. ID and
arbitration register must match exactly.
MEME=1: Message center 15 mask registers are
ANDed with Global Mask register. Only bits
corresponding to 1 in resulting value are compared
in ID and arbitration registers.
Message Center 15,
Extended 29-bit
arbitration (CAN 2.0B)
Message Center 15
Arbitration Registers 0-3
(Located in Message
Center 15, MOVX
memory)
Message Center 15 Mask
Registers 0-3
(Located in each CAN
Control/Status/Mask
Register bank, MOVX
memory)
EX/ST =1
MEME=0: Mask register ignored. ID and
arbitration register must match exactly.
MEME=1: Message center 15 mask registers are
ANDed with Global Mask register. Only bits
corresponding to 1 in resulting value are compared
in ID and arbitration registers.
MESSAGE BUFFERING/OVERWRITE
If a message center is configured for reception (T/
R
=0) and the previous message has not been read
(DTUP=1), then the disposition of an incoming message to that message center will be controlled by the
WTOE bit (located in CAN Arbitration Register 3 of each message center). When WTOE=0, the
incoming message will be discarded and the current message untouched.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS80C390_00 制造商:DALLAS 制造商全稱(chēng):Dallas Semiconductor 功能描述:High-Speed Microcontroller User’s Guide Supplement
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DS80C390+FCR 制造商:Maxim Integrated Products 功能描述:MICRO DUAL CAN LQFP PB-FREE - Trays
DS80C390+QCR 制造商:Maxim Integrated Products 功能描述:MICRO DUAL CAN PLCC PB-FREE - Rail/Tube
DS80C390+QNR 制造商:Maxim Integrated Products 功能描述:MICRO DUAL CAN PLCC IND PB-FREE - Rail/Tube
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