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IN2515 Datasheet(PDF) 10 Page - IK Semicon Co., Ltd |
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IN2515 Datasheet(HTML) 10 Page - IK Semicon Co., Ltd |
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10 / 17 page  IN2515 10 2017, Nov, Rev. 01 FUNCTIONALITY IN2515AN, IN2515ADW, IN2515BN, IN2515BDW (further IN2515) are stand-alone Controller Area Network (CAN) controllers that implements the CAN specification, version 2.0B. It is capable of transmitting and receiving both standard and extended data and remote frames. The IN2515 has two acceptance masks and six acceptance filters that are used to filter out unwanted messages, thereby reducing the host MCUs overhead. The IN2515 is designed to interface directly with the Serial Peripheral Interface (SPI) port available on many microcontrollers and supports Mode 0,0 and Mode 1,1. Commands and data are sent to the device via the SI pin, with data being clocked in on the rising edge of SCK. Data is driven out by the MCP2515 (on the SO line) on the falling edge of SCK. The CS pin must be held low while any operation is performed. The IN2515 expects the first byte after CS lowered to be the instruction/command byte. This means that CS must be raised and then lowered again to input another command. Table 6 contains complete list of bytes of SPI instruction set. On detail output and input diagram of both operation modes (Mode 0.0 & Mode 1.1) please refer to Fig 15 & 16. SPI Instruction Set Table 6 Instruction Name Instruction Format Description RESET 1100 0000 Resets internal registers to default state, set Configuration mode. READ 0000 0011 Read data from register beginning at selected address Read RX Buffer 1001 0nm0 When reading a receive buffer, reduces the overhead of a normal read command by placing the address pointer at one of four locations, as indicated by „n,m‟. Note: The associated RX flag bit (CANINTF.RXnIF) will be cleared after bringing CS high. WRITE 0000 0010 Write data to register beginning at selected address. Load TX Buffer 0100 0abc When loading a transmit buffer, reduces the overhead of a normal Write command by placing the address pointer at one of six locations as indicated by „a,b,c‟. RTS (Message Request-To- Send) 1000 0nnn Instructs controller to begin message transmission sequence for any of the transmit buffers. Read Status 1010 0000 Quick polling command that reads several status bits for transmit and receive functions. RX Status 1011 0000 Quick polling command that indicates filter match and message type (standard, extended and/or remote) of received message. Bit Modify 0000 0101 Allows the user to set or clear individual bits in a particular register. Note: Not all registers can be bit-modified with this command. Executing this command on registers that are not bitmodifiable will force the mask to FFh. |
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