Datasheet

 2010-2012 Microchip Technology Inc. DS39977F-page 193

PIC18F66K80 FAMILY

FIGURE 11-4: 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

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

IBF: Input Buffer Full Status bit

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

0 = No word has been received

bit 6

OBF: Output Buffer Full Status bit

1 = The output buffer still holds a previously written word

0 = The output buffer has been read

bit 5

IBOV: Input Buffer Overflow Detect bit

1 = A write occurred when a previously input word had 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’

Q1 Q2 Q3 Q4

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4

IBF

OBF

PSPIF

PORTD<7:0>