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Hardware Interfacing

Hardware Interfacing. rhussin. 8051 Pin-out. Power - Vcc, Vss Reset - RST Crystal - XTAL[1,2] External device interfacing EA, ALE, PSEN, WR, RD I/O Port P0[7;0], P1[7:0], P2[7:0], P3 P3 is shared with control lines Serial I/O RxD, TxD, external interrupts INT0, INT1

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PPI

PPI. Programmable Peripheral Interface Parallel port Interface 8255. 8255 PPI. Addressing the 8255. A1 A0 = 00 Port A ; IN, OUT 8 bits at a time = 01 Port B ; IN, OUT 8 bits at a time = 10 Port C ; IN, OUT 8 bits at a time = 11 Control Register; Write ONLY!. Addressing Example

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Mode 0 simple - PowerPoint PPT Presentation

Hardware Interfacing

PPI