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PIC16F877AI/ML 数据表(PDF) 52 Page - Microchip Technology |
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PIC16F877AI/ML 数据表(HTML) 52 Page - Microchip Technology |
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52 / 234 page  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 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 |
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