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The system adopts SJA1000CAN controller and PCA82C250 bus transceiver design CAN communication interface. SJA1000 is PHILIPS company launched a CAN communications controller, support CAN2.0A, 2.0B protocol. Because of its design is based on the early 80C51 single-chip applications, embedded latch can make 80C51 chip without any external device can be directly connected. However, the S3C2410A address bus and data bus are separated, can not be directly connected to SJA1000, so it is necessary to simulate the similar 80C51 MCU external memory timing to use. The circuit of Figure 3, the use of a ” or ” 74LS32 and a ” or ” 74LS02 combination, with the address bus, the first simulation of a ALE ( address latch signals), the SJA1000 internal register address latch, and then to the SJA1000 internal register write data. So, using ARM two external memory access instruction, can simulate the SJA1000 required timing. Using S3C2410A chip selection signal nGCS4 and address bus LADDR2, after ” or ” door to simulate SJA1000 physical port address for the 0×20000008, the chip selection signal nGCS4 and address bus LADDR3, after ” or ” door, simulated SJA1000 data port address 0×20000004.
AK-47
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Thank you an amazing publish, will examine your personal others topics. thank you your thoughts for this, I experienced a lttle bit made an impact to by this article. Thanks again! You earn a terrific point. Portrays natures best by the fantastic report here. I feel if more individuals consideration for it like this, they’d have a better time period receive the hold ofing the difficulty.
The system adopts SJA1000CAN controller and PCA82C250 bus transceiver design CAN communication interface. SJA1000 is PHILIPS company launched a CAN communications controller, support CAN2.0A, 2.0B protocol. Because of its design is based on the early 80C51 single-chip applications, embedded latch can make 80C51 chip without any external device can be directly connected. However, the S3C2410A address bus and data bus are separated, can not be directly connected to SJA1000, so it is necessary to simulate the similar 80C51 MCU external memory timing to use. The circuit of Figure 3, the use of a ” or ” 74LS32 and a ” or ” 74LS02 combination, with the address bus, the first simulation of a ALE ( address latch signals), the SJA1000 internal register address latch, and then to the SJA1000 internal register write data. So, using ARM two external memory access instruction, can simulate the SJA1000 required timing. Using S3C2410A chip selection signal nGCS4 and address bus LADDR2, after ” or ” door to simulate SJA1000 physical port address for the 0×20000008, the chip selection signal nGCS4 and address bus LADDR3, after ” or ” door, simulated SJA1000 data port address 0×20000004.
AK-47