Datasheet

 2003-2013 Microchip Technology Inc. DS30491D-page 153

PIC18F6585/8585/6680/8680

FIGURE 10-29: PARALLEL SLAVE PORT WRITE WAVEFORMS

R-0 R-0 R/W-0 R/W-0 U-0 U-0 U-0 U-0

IBF OBF IBOV PSPMODE

— — — —

bit 7 bit 0

bit 7 IBF: Input Buffer Full Status bit

1 = A data byte has been received and is waiting to be read by the CPU

0 = No data byte has been received

bit 6 OBF: Output Buffer Full Status bit

1 = The output buffer still holds a previously written data byte

0 = The output buffer has been read

bit 5 IBOV: Input Buffer Overflow Detect bit

1 = A write occurred when a previously input data byte has not been read

(must be cleared in software)

0 = No overflow occurred

bit 4 PSPMODE: Parallel Slave Port Mode Select bit

1 = Parallel Slave Port mode

0 = General Purpose I/O mode

bit 3-0 Unimplemented: Read as ‘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

Q1 Q2 Q3 Q4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

IBF

OBF

PSPIF

PORTD<7:0>

18F8680.book Page 153 Tuesday, January 29, 2013 1:32 PM