Datasheet

PIC18F87J72 FAMILY
DS39979A-page 242 Preliminary  2010 Microchip Technology Inc.
REGISTER 19-3: BAUDCON1: BAUD RATE CONTROL REGISTER 1
R/W-0 R-1 R/W - 0 R/W-0 R/W-0 U-0 R/W-0 R/W-0
ABDOVF RCMT RXDTP TXCKP BRG16
— WUE ABDEN
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7 ABDOVF: Auto-Baud Acquisition Rollover Status bit
1 = A BRG rollover has occurred during Auto-Baud Rate Detect mode (must be cleared in software)
0 = No BRG rollover has occurred
bit 6 RCMT: Receive Operation Idle Status bit
1 = Receive operation is Idle
0 = Receive operation is active
bit 5 RXDTP: Received Data Polarity Select bit (Asynchronous mode only)
1 = RXx data is inverted
0 = RXx data is not inverted
bit 4 TXCKP: Clock and Data Polarity Select bit
Asynchronous mode:
1 = Transmit idle state is low
0 = Transmit idle state is high
Synchronous mode:
1 = CKx clock idle state is high
0 = CKx clock idle state is low
bit 3 BRG16: 16-Bit Baud Rate Register Enable bit
1 = 16-bit Baud Rate Generator – SPBRGH1 and SPBRG1
0 = 8-bit Baud Rate Generator – SPBRG1 only (Compatible mode), SPBRGH1 value is ignored
bit 2 Unimplemented: Read as ‘0’
bit 1 WUE: Wake-up Enable bit
Asynchronous mode:
1 = EUSART will continue to sample the RX1 pin – interrupt generated on falling edge; bit cleared in
hardware on following rising edge
0 = RX1 pin is not monitored or a rising edge detected
Synchronous mode:
Unused in this mode.
bit 0 ABDEN: Auto-Baud Detect Enable bit
Asynchronous mode:
1 = Enable baud rate measurement on the next character. Requires reception of a Sync field (55h);
cleared in hardware upon completion.
0 = Baud rate measurement is disabled or completed
Synchronous mode:
Unused in this mode.