PIC18F2220/2320/4220/4320
REGISTER 10-1: TRISE REGISTER
R-0
IBF
R-0
R/W-0
IBOV
R/W-0
U-0
—
R/W-1
R/W-1
R/W-1
OBF
PSPMODE
TRISE2
TRISE1
TRISE0
bit 7
bit 0
bit 7
bit 6
bit 5
IBF: Input Buffer Full Status bit
1= A word has been received and waiting to be read by the CPU
0= No word has been received
OBF: Output Buffer Full Status bit
1= The output buffer still holds a previously written word
0= The output buffer has been read
IBOV: Input Buffer Overflow Detect bit (in Microprocessor mode)
1= A write occurred when a previously input word 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
bit 2
Unimplemented: Read as ‘0’
TRISE2: RE2 Direction Control bit
1= Input
0= Output
bit 1
bit 0
TRISE1: RE1 Direction Control bit
1= Input
0= Output
TRISE0: RE0 Direction Control bit
1= Input
0= Output
Legend:
R = Readable bit
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared x = Bit is unknown
- n = Value at POR
DS39599C-page 112
2003 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
