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MCP2510-IST Datasheet(PDF) 52 Page - Microchip Technology |
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MCP2510-IST Datasheet(HTML) 52 Page - Microchip Technology |
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52 / 76 page  MCP2510 DS21291C-page 52 Preliminary 2000 Microchip Technology Inc. 9.4 Loopback Mode This mode will allow internal transmission of messages from the transmit buffers to the receive buffers without actually transmitting messages on the CAN bus. This mode can be used in system development and testing. In this mode the ACK bit is ignored and the device will allow incoming messages from itself just as if they were coming from another node. The loopback mode is a silent mode, meaning no messages will be transmitted while in this state, including error flags or acknowledge signals. The TXCAN pin will be in a reccessive state while the device is in this mode. The filters and masks can be used to allow only particular messages to be loaded into the receive registers. The masks can be set to all zeros to provide a mode that accepts all mes- sages. The loopback mode is activated by setting the mode request bits in the CANCTRL register. 9.5 Normal Mode This is the standard operating mode of the MCP2510. In this mode the device actively monitors all bus mes- sages and generates acknowledge bits, error frames, etc. This is also the only mode in which the MCP2510 will transmit messages over the CAN bus. REGISTER 9-1: CANCTRL - CAN Control Register (ADDRESS: xFh) R/W-1 R/W-1 R/W-1 R/W-0 U-0 R/W-1 R/W-1 R/W-1 REQOP2 REQOP1 REQOP0 ABAT — CLKEN CLKPRE1CLKPRE0 R = Readable bit W = Writable bit C = Bit can be cleared by MCU but not set U = Unimplemented - reads as ‘0’ - n = Value at POR reset bit 7 bit 0 bit 7-5: REQOP<2:0>: Request Operation Mode 000 = Set Normal Operation Mode 001 = Set Sleep Mode 010 = Set Loopback Mode 011 = Set Listen Only Mode 100 = Set Configuration Mode All other values for REQOP bits are invalid and should not be used bit 4: ABAT: Abort All Pending Transmissions 1 = Request abort of all pending transmit buffers 0 = Terminate request to abort all transmissions bit 3: Unimplemented: Reads as ‘0’ bit 2: CLKEN: CLKOUT Pin Enable 0 = CLKOUT pin disabled (Pin is in high impedance state) 1 =CLKOUT pin enabled bit 1-0: CLKPRE<1:0>: CLKOUT Pin Prescaler 00 = FCLKOUT = System Clock/1 01 = FCLKOUT = System Clock/2 10 = FCLKOUT = System Clock/4 11 = FCLKOUT = System Clock/8 |
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