PIC16F87XA
DS39582B-page 50
2003 Microchip Technology Inc.
TABLE 4-10:
SUMMARY OF REGISTERS ASSOCIATED WITH PORTE
REGISTER 4-1:
TRISE REGISTER (ADDRESS 89h)
Address
Name
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Value on:
POR, BOR
Value on
all other
Resets
09h
PORTE
—
—
—
—
—
RE2
RE1
RE0
---- -xxx
---- -uuu
89h
TRISE
IBF
OBF
IBOV
PSPMODE
—
PORTE Data Direction bits
0000 -111
0000 -111
9Fh
ADCON1
ADFM
ADCS2
—
—
PCFG3
PCFG2
PCFG1
PCFG0
00-- 0000
00-- 0000
Legend:
x
= unknown,
u
= unchanged,
-
= unimplemented, read as ‘
0
’. Shaded cells are not used by PORTE.
R-0
R-0
R/W-0
R/W-0
U-0
R/W-1
R/W-1
R/W-1
IBF
OBF
IBOV
PSPMODE
—
Bit 2
Bit 1
Bit 0
bit 7
bit 0
Parallel Slave Port Status/Control Bits:
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 (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
Unimplemented: Read as ‘
0
’
PORTE Data Direction Bits:
bit 2
Bit 2: Direction Control bit for pin RE2/CS/AN7
1
= Input
0
= Output
bit 1
Bit 1: Direction Control bit for pin RE1/WR/AN6
1
= Input
0
= Output
bit 0
Bit 0: 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’
- n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
http://www.xinpian.net
提供单片机解密、IC解密、芯片解密业务
010-62245566 13810019655
