Datasheet

 2007-2012 Microchip Technology Inc. DS39778E-page 173
PIC18F87J11 FAMILY
REGISTER 12-8: PMSTATL: PARALLEL PORT STATUS LOW BYTE REGISTER
R-1 R/W-0 U-0 U-0 R-1 R-1 R-1 R-1
OBE OBUF — — OB3E OB2E OB1E OB0E
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 OBE: Output Buffer Empty Status bit
1 = All readable output buffer registers are empty
0 = Some or all of the readable output buffer registers are full
bit 6 OBUF: Output Buffer Underflow Status bit
1 = A read occurred from an empty output byte register (must be cleared in software)
0 = No underflow occurred
bit 5-4 Unimplemented: Read as ‘0’
bit 3-0 OB3E:OB0E: Output Buffer n Status Empty bits
1 = Output buffer is empty (writing data to the buffer will clear this bit)
0 = Output buffer contains data that has not been transmitted