Datasheet

PIC16F87XA
DS39582C-page 50  2001-2013 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 2Bit 1Bit 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