PIC18C658 MICROCHIP [Microchip Technology], PIC18C658 Datasheet - Page 226

• Manufacturer Part Number: PIC18C658
• Description: High-Performance Microcontrollers with CAN Module
• Manufacturer: MICROCHIP [Microchip Technology]

PIC18CXX8
17.13.6 ERROR INTERRUPT
When the error interrupt is enabled, an interrupt is gen-
erated 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.
17.13.6.1 Receiver Overflow
An overflow condition occurs when the MAB has assem-
bled 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.RX
will be set to indicate the overflow condition. This bit
must be cleared by the MCU.
17.13.6.2 Receiver Warning
The receive error counter has reached the MCU warn-
ing limit of 96.
17.13.6.3 Transmitter Warning
The transmit error counter has reached the MCU warn-
ing limit of 96.
DS30475A-page 226
Advanced Information
N
OVFL bit
17.13.6.4 Receiver Bus-Passive
The
error-passive limit of 127 and the device has gone to
error-passive state.
17.13.6.5 Transmitter Bus-Passive
The transmit error counter has exceeded the error-
passive limit of 127 and the device has gone to error-
passive state.
17.13.6.6 Bus-Off
The transmit error counter has exceeded 255 and the
device has gone to bus-off state.
17.13.7 INTERRUPT ACKNOWLEDGE
Interrupts are directly associated with one or more sta-
tus flags in the PIF 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 MCU
until the interrupt condition is removed.
receive
error counter
2000 Microchip Technology Inc.
has exceeded
the