PIC18F2680ISOSQTP datasheet(343/482 Pages) MICROCHIP

343 / 482 page

Preliminary

DS39625C-page 341

PIC18F2585/2680/4585/4680

23.15.5

BUS ACTIVITY WAKE-UP

INTERRUPT

When the PIC18F2585/2680/4585/4680 devices are in

Sleep mode and the bus activity wake-up interrupt is

enabled, an interrupt will be generated and the WAKIF

bit will be set when activity is detected on the CAN bus.

This interrupt causes the PIC18F2585/2680/4585/

4680 devices to exit Sleep mode. The interrupt is reset

by the MCU, clearing the WAKIF bit.

23.15.6

ERROR INTERRUPT

When the error interrupt is enabled, an interrupt is

generated if an overflow condition occurs or if the error

state of the transmitter or receiver has changed. The

error flags in COMSTAT will indicate one of the

following conditions.

23.15.6.1

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

RXBnOVFL bit in the COMSTAT register will be set to

indicate the overflow condition. This bit must be cleared

by the MCU.

23.15.6.2

Receiver Warning

The receive error counter has reached the MCU

warning limit of 96.

23.15.6.3

Transmitter Warning

The transmit error counter has reached the MCU

warning limit of 96.

23.15.6.4

Receiver Bus Passive

The receive error counter has exceeded the error-

passive limit of 127 and the device has gone to

error-passive state.

23.15.6.5

Transmitter Bus Passive

The transmit error counter has exceeded the error-

passive limit of 127 and the device has gone to

error-passive state.

23.15.6.6

Bus-Off

The transmit error counter has exceeded 255 and the

device has gone to bus-off state.

23.15.6.7

Interrupt Acknowledge

Interrupts are directly associated with one or more

status flags in the PIR register. Interrupts are pending

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

microcontroller until the interrupt condition is removed.

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