PIC18F258-ESLASHLSQTP datasheet(241/402 Pages) MICROCHIP

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DS41159E-page 239

PIC18FXX8

TABLE 19-3:

VALUES FOR ICODE<2:0>

19.13.4

MESSAGE ERROR INTERRUPT

When an error occurs during transmission or reception

of a message, the message error flag IRXIF will be set

and if the IRXIE bit is set, an interrupt will be generated.

This is intended to be used to facilitate baud rate

determination when used in conjunction with Listen

Only mode.

19.13.5

BUS ACTIVITY WAKE-UP

INTERRUPT

When the PIC18FXX8 is 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

PIC18FXX8 to exit Sleep mode. The interrupt is reset

by the MCU, clearing the WAKIF bit.

19.13.6

ERROR INTERRUPT

When the error interrupt is enabled, an interrupt is

generated if an overflow condition occurs or if the error

state of transmitter or receiver has changed. The error

flags in COMSTAT will indicate one of the following

conditions.

19.13.6.1

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

COMSTAT.RXnOVFL bit will be set to indicate the

overflow condition. This bit must be cleared by the

MCU.

19.13.6.2

Receiver Warning

The receive error counter has reached the MCU

warning limit of 96.

19.13.6.3

Transmitter Warning

The transmit error counter has reached the MCU

warning limit of 96.

19.13.6.4

Receiver Bus Passive

The receive error counter has exceeded the error-

passive limit of 127 and the device has gone to

error-passive state.

19.13.6.5

Transmitter Bus Passive

The transmit error counter has exceeded the error-

passive limit of 127 and the device has gone to

error-passive state.

19.13.6.6

Bus-Off

The transmit error counter has exceeded 255 and the

device has gone to bus-off state.

19.13.7

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 cannot be reset by the

microcontroller until the interrupt condition is removed.

ICOD

<2:0>

Interrupt

Boolean Expression

000

None

ERR•WAK•TX0•TX1•TX2•RX0•

RX1

001

Error

ERR

010

TXB2

ERR•TX0•TX1•TX2

011

TXB1

ERR•TX0•TX1

100

TXB0

ERR•TX0

101

RXB1

ERR•TX0•TX1•TX2•RX0•RX1

110

RXB0

ERR•TX0•TX1•TX2•RX0

111

Wake on

Interrupt

ERR•TX0•TX1•TX2•RX0•RX1•

WAK

Key:

ERR = ERRIF * ERRIE

RX0 = RXB0IF * RXB0IE

TX0 = TXB0IF * TXB0IE

RX1 = RXB1IF * RXB1IE

TX1 = TXB1IF * TXB1IE

WAK = WAKIF * WAKIE

TX2 = TXB2IF * TXB2IE

PIC18F258-E/LSQTP Datasheet(PDF) 241 Page - Microchip Technology

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