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MCP2515T-E Datasheet(PDF) 58 Page - Microchip Technology |
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MCP2515T-E Datasheet(HTML) 58 Page - Microchip Technology |
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58 / 84 page  MCP2515 DS21801E-page 58 © 2007 Microchip Technology Inc. 10.4 Loopback Mode Loopback 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 recessive state. 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 messages. The Loopback mode is activated by setting the mode request bits in the CANCTRL register. 10.5 Normal Mode Normal mode is the standard operating mode of the MCP2515. In this mode, the device actively monitors all bus messages and generates acknowledge bits, error frames, etc. This is also the only mode in which the MCP2515 will transmit messages over the CAN bus. REGISTER 10-1: CANCTRL – CAN CONTROL REGISTER (ADDRESS: XFh) R/W-1 R/W-0 R/W-0 R/W-0 R/W-0 R/W-1 R/W-1 R/W-1 REQOP2 REQOP1 REQOP0 ABAT OSM CLKEN CLKPRE1 CLKPRE0 bit 7 bit 0 Legend: R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’ -n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown bit 7-5 REQOP: Request Operation Mode bits <2:0> 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 On power-up, REQOP = b’111’ bit 4 ABAT: Abort All Pending Transmissions bit 1 = Request abort of all pending transmit buffers 0 = Terminate request to abort all transmissions bit 3 OSM: One Shot Mode bit 1 = Enabled. Message will only attempt to transmit one time 0 = Disabled. Messages will reattempt transmission, if required bit 2 CLKEN: CLKOUT Pin Enable bit 1 = CLKOUT pin enabled 0 = CLKOUT pin disabled (Pin is in high-impedance state) bit 1-0 CLKPRE: CLKOUT Pin Prescaler bits <1:0> 00 =FCLKOUT = System Clock/1 01 =FCLKOUT = System Clock/2 10 =FCLKOUT = System Clock/4 11 =FCLKOUT = System Clock/8 |
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