SCM and SJA1000 CAN controller interface circuit

Published:2011/7/8 3:30:00 Author:Fiona | Keyword: controller interface | From:SeekIC

The picture shows the C8051F020 SCM and hardware connection circuit principle of SJA1000 controller.SJA1000 takes up 0x8000-0x80FF external RAM space.When SCM visits the above space,the chip select signal will select SJA1000. C8051F020 has high and low two external memory interfaces. Therefore,the AD0-AD7 of SJA1000 is connected to high port P7 of C8051F020, CS is connected to the chip select signal of external memory which the base address is 0x8000.When C8051F020 visits 0x8000-0x80FF,CPU can execute the corresponding read / write operations to SJA1000.RD,WR and ALE of SJA1000 are connected to corresponding pin of C8051F020,INT is connected to the INT0 pin of C8051F020,so that C8051F020 can visit SJA1000 through interrupt mode.



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