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MCP2510-ISO Datasheet(PDF) 46 Page - Microchip Technology |
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MCP2510-ISO Datasheet(HTML) 46 Page - Microchip Technology |
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46 / 80 page  MCP2510 DS21291F-page 46 © 2007 Microchip Technology Inc. 7.6 Error Interrupt When the error interrupt is enabled (CANINTE.ERRIE = 1) an interrupt is generated on the INT pin if an over- flow condition occurs or if the error state of transmitter or receiver has changed. The Error Flag Register (EFLG) will indicate one of the following conditions. 7.6.1 RECEIVER OVERFLOW An overflow condition occurs when the MAB has assembled a valid received message (the message meets the criteria of the acceptance filters) and the receive buffer associated with the filter is not available for loading of a new message. The associated EFLG.RXNOVR bit will be set to indicate the overflow condition. This bit must be cleared by the MCU. 7.6.2 RECEIVER WARNING The receive error counter has reached the MCU warn- ing limit of 96. 7.6.3 TRANSMITTER WARNING The transmit error counter has reached the MCU warn- ing limit of 96. 7.6.4 RECEIVER ERROR-PASSIVE The receive error counter has exceeded the error- pas- sive limit of 127 and the device has gone to error- pas- sive state. 7.6.5 TRANSMITTER ERROR-PASSIVE The transmit error counter has exceeded the error- passive limit of 127 and the device has gone to error- passive state. 7.6.6 BUS-OFF The transmit error counter has exceeded 255 and the device has gone to bus-off state. 7.7 Interrupt Acknowledge Interrupts are directly associated with one or more sta- tus flags in the CANINTF register. Interrupts are pend- ing as long as one of the flags is set. Once an interrupt flag is set by the device, the flag can not be reset by the MCU until the interrupt condition is removed. |
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