MCP2510-SLASHST datasheet(46/80 Pages) MICROCHIP

46 / 80 page

MCP2510

DS21291F-page 46

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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