PIC18F2480_09 Datasheet, PDF (287/490 Pages) Microchip Technology – 28/40/44-Pin Enhanced Flash Microcontrollers with ECAN Technology, 10-Bit A/D and nanoWatt Technology

PIC18F2480/2580/4480/4580
REGISTER 24-4: COMSTAT: COMMUNICATION STATUS REGISTER
R/C-0
R/C-0
Mode 0
RXB0OVFL RXB1OVFL
R-0
TXBO
R-0
TXBP
R-0
RXBP
R-0
TXWARN
R-0
RXWARN
R-0
EWARN
Mode 1
R/C-0
—
R/C-0
RXBnOVFL
R-0
TXB0
R-0
TXBP
R-0
RXBP
R-0
R-0
TXWARN RXWARN
R-0
EWARN
Mode 2
R/C-0
R/C-0
FIFOEMPTY RXBnOVFL
bit 7
R-0
TXBO
R-0
TXBP
R-0
RXBP
R-0
R-0
TXWARN RXWARN
R-0
EWARN
bit 0
Legend:
R = Readable bit
-n = Value at POR
C = Clearable bit
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 7
Mode 0:
RXB0OVFL: Receive Buffer 0 Overflow bit
1 = Receive Buffer 0 overflowed
0 = Receive Buffer 0 has not overflowed
Mode 1:
Unimplemented: Read as ‘0’
Mode 2:
FIFOEMPTY: FIFO Not Empty bit
1 = Receive FIFO is not empty
0 = Receive FIFO is empty
bit 6
Mode 0:
RXB1OVFL: Receive Buffer 1 Overflow bit
1 = Receive Buffer 1 overflowed
0 = Receive Buffer 1 has not overflowed
Mode 1, 2:
RXBnOVFL: Receive Buffer n Overflow bit
1 = Receive Buffer n has overflowed
0 = Receive Buffer n has not overflowed
bit 5
TXBO: Transmitter Bus-Off bit
1 = Transmit error counter > 255
0 = Transmit error counter ≤ 255
bit 4
TXBP: Transmitter Bus Passive bit
1 = Transmit error counter > 127
0 = Transmit error counter ≤ 127
bit 3
RXBP: Receiver Bus Passive bit
1 = Receive error counter > 127
0 = Receive error counter ≤ 127
bit 2
TXWARN: Transmitter Warning bit
1 = Transmit error counter > 95
0 = Transmit error counter ≤ 95
bit 1
RXWARN: Receiver Warning bit
1 = 127 ≥ Receive error counter > 95
0 = Receive error counter ≤ 95
bit 0
EWARN: Error Warning bit
This bit is a flag of the RXWARN and TXWARN bits.
1 = The RXWARN or the TXWARN bits are set
0 = Neither the RXWARN or the TXWARN bits are set
© 2009 Microchip Technology Inc.
DS39637D-page 287