Basic operations of 8085 microprocessor , Electrical Engineering

Basic Operations of 8085 Microprocessor

The 8085 microprocessor  performs followings  five  basic  operations .

1. Opcode Fetch :  Reading and decoding  operation code  of n instruction.

2. Memory Read: Reading data  from  memory.

3. Memory Write : Writing data  into  memory.

4. I. O Read: Accepting  data from  input  port.

5. I/ O  Write : Sending data  to output  port.

These  operations  will be  discussed in detail  with their  timing diagrams in  chapter6.

Here  only memory  read  operation is explained   to show  how  different  busses  are used  together  to perform  such  operations.

Suppose  data byte  stored  at location 2010H   is to be  read in  memory  read  operation  followings  steps are followed  to perform  this operations:

1. The 16 bit  memory  address is placed  on the 16bit  address bus by the microprocessor.

2. The address is decoded by  the memory  decoder  and the  desired  memory  location is selected.

3. For  reading  the data  from this  location  a RD signal  is generated by  the control  unit  of the  microprocessor  which  enables  the memory  chip.

4. The data  byte  from the  memory  location  is placed  on the  data bus.

5. Through  data bus data  byte is brought  into the  microprocessor  register.

Posted Date: 4/4/2013 3:14:24 AM | Location : United States







Related Discussions:- Basic operations of 8085 microprocessor , Assignment Help, Ask Question on Basic operations of 8085 microprocessor , Get Answer, Expert's Help, Basic operations of 8085 microprocessor Discussions

Write discussion on Basic operations of 8085 microprocessor
Your posts are moderated
Related Questions
Name the materials used in case of Solder and give reasons. Solder : For soft solders tin, lead (in 50-50 ratio) alloy and for hard solders copper- zinc and silver alloy

Q. Elucidate the nature of signals produced on subscriber's loop by a pulse dialer and a touch tone dialer.  Ans: DTMF is a simple two-of -eight encoding scheme where every

Q The electric ?eld intensity due to a point charge in free space is given to be (-¯ ax -¯ ay +¯ az)/√ 12V/mat (0,0,1) and 6 ¯ az at (2,2,0) Determine the location and the value

Q. A coil is formed by connecting 15 conducting loops, or turns, in series. Each loop has length l = 2.5 m and width w = 10 cm. The 15-turn coil is rotated at a constant speed of 3

Q. A silicon BJT has an emitter current of 5m Aat 300 K when the BEJ is forward-biased by vBE = 0.7 V. Find the reverse saturation current of the BEJ. Neglecting ICBO, calculate iC

Define Smoothing the Output? The output of a DAC is stepped, such as the analog waveforms which were sampled and held. This stepped, or staircase effect is a distortion, and it

Q. Explain the effect of feedback on amplifier bandwidth? The bandwidth of an amplifier is defined as the range of frequencies for which the gain remains constant.The gain -ban

Define Hysteresis Hysteresis is the 'lagging' effect of flux density B whenever there are changes in the magnetic field strength H. When an initially unmagnetized ferromagnetic

Redraw the Wheat stone bridge circuit of Figure and show that Equation holds good for the null condition when the meter A reads zero current.

Using the coefficients obtained for the noisy signal and the FIR filter in Q1(c)(i) implement on the TMS320VC5510DSK. You can use and modify any of the files provided in the Board