Microprocessor 8085 Essay

2686 WordsMay 27, 201511 Pages
Chapter 3 Microprocessor 8085 Architecture Outline   Pin out diagrams and pin detail Internal architecture of 8085  Timing and control unit  Instruction registers and decoder  Microprocessor communication and bus timing  Address  de-multiplexing Timing diagrams  Instruction cycle, machine cycle and T-state  Opcode fetch and rd/wr machine cycle  Generation of control signals  Memory rd/wr and I/O rd/wr Intel 8085 Pin Configuration Pin out diagrams and pin details   The 8085 is an 8-bit general purpose microprocessor that can address 64K Byte of memory. It has 40 pins and uses +5V for power. It can run at a maximum frequency of 3 MHz.  The pins on the chip can be grouped into 6 groups:  Address Bus.  Data Bus.  Control and Status Signals.  Power supply and frequency.  Externally Initiated Signals.  Serial I/O ports. The 8085 pin out and Signals . X1 X2 RESET OUT SOD SID TRAP RST 7.5 RST 6.5 RST 5.5 INTR INTA AD0 AD1 AD2 AD3 AD4 AD5 AD6 AD7 Vss 1 2 3 4 5 6 7 8085A P 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 Vcc HOLD HLDA +5V Serial I/O ports SID 4 SOD TRAP 6 IO/M S1 RD WR ALE S0 A15 A14 A13 A12 A11 A10 A9 A8 RST 7.5 7 RST 6.5 8 RST 5.5 1 2 40 20 X1 X2 Vcc Vss 5 READY GND 9 CLK (OUT) A15 28 High-order Address bus RESET IN Externally initiated signals A8 21 8085A P AD7 19 Address/Data bus AD0 12 INTR 10 READY 35 HOLD 39 30 RESET IN 36 29 33 External signals Acknowledg ment INTA HLDA 34 11 38 3 RESET OUT 32 31 37 CLK (OUT) ALE S0 S1 IO/M RD WR Control & status signals

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