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MCP2515T-E Datasheet(PDF) 16 Page - Microchip Technology |
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MCP2515T-E Datasheet(HTML) 16 Page - Microchip Technology |
16 / 84 page MCP2515 DS21801E-page 16 © 2007 Microchip Technology Inc. 3.5 TXnRTS PINS The TXnRTS pins are input pins that can be configured as: • Request-to-send inputs, which provides an alternative means of initiating the transmission of a message from any of the transmit buffers • Standard digital inputs Configuration and control of these pins is accomplished using the TXRTSCTRL register (see Register 3-3). The TXRTSCTRL register can only be modified when the MCP2515 is in Configuration mode (see Section 10.0 “Modes of Operation”). If configured to operate as a request-to-send pin, the pin is mapped into the respective TXBnCTRL.TXREQ bit for the transmit buffer. The TXREQ bit is latched by the falling edge of the TXnRTS pin. The TXnRTS pins are designed to allow them to be tied directly to the RXnBF pins to automatically initiate a message transmission when the RXnBF pin goes low. The TXnRTS pins have internal pull-up resistors of 100 k Ω (nominal). 3.6 Aborting Transmission The MCU can request to abort a message in a specific message buffer by clearing the associated TXBnCTRL.TXREQ bit. In addition, all pending messages can be requested to be aborted by setting the CANCTRL.ABAT bit. This bit MUST be reset (typically after the TXREQ bits have been verified to be cleared) to continue transmitting messages. The CANCTRL.ABTF flag will only be set if the abort was requested via the CANCTRL.ABAT bit. Aborting a message by resetting the TXREQ bit does NOT cause the ABTF bit to be set. Note: Messages that were transmitting when the abort was requested will continue to transmit. If the message does not successfully complete transmission (i.e., lost arbitration or was interrupted by an error frame), it will then be aborted. |
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