PIC16F87XA
TABLE 4-10: SUMMARY OF REGISTERS ASSOCIATED WITH PORTE
Value on
all other
RESETS
Value on:
POR, BOR
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
09h
89h
9Fh
PORTE
TRISE
—
—
—
—
—
—
RE2
RE1
RE0
---- -xxx ---- -uuu
IBF
OBF
IBOV PSPMODE
PORTE Data Direction Bits 0000 -111 0000 -111
ADCON1 ADFM ADCS2
—
—
PCFG3 PCFG2 PCFG1 PCFG0 --0- 0000 --0- 0000
Legend: x= unknown, u= unchanged, -= unimplemented, read as ’0’. Shaded cells are not used by PORTE.
REGISTER 4-1:
TRISE REGISTER (ADDRESS 89h)
R-0
IBF
R-0
R/W-0
IBOV
R/W-0
U-0
R/W-1
Bit2
R/W-1
Bit1
R/W-1
Bit0
OBF
PSPMODE
—
bit 7
bit 0
Parallel Slave Port Status/Control Bits:
bit 7
bit 6
bit 5
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
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= PORTD functions in Parallel Slave Port mode
0= PORTD functions in general purpose I/O mode
bit 3
bit 2
Unimplemented: Read as '0'
PORTE Data Direction Bits:
Bit2: Direction Control bit for pin RE2/CS/AN7
1= Input
0= Output
bit 1
bit 0
Bit1: Direction Control bit for pin RE1/WR/AN6
1= Input
0= Output
Bit0: Direction Control bit for pin RE0/RD/AN5
1= Input
0= Output
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
’0’ = Bit is cleared x = Bit is unknown
- n = Value at POR
’1’ = Bit is set
DS39582A-page 48
AdvanceInformation
2001 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
