Three byte instruction , Electrical Engineering

Three byte instruction

The  instruction which  have 16  bit data address  as its  operand  are three byte  instruction. They  need three  memory  locations to store  them in memory.

Followings  are some  examples  of three  byte  instructions .

LXI 16 bit

JMP 16 bit  address

CALL 16 bit address

Let  us consider  a jump  instruction JMP 2050H. Now  notice  how this  instruction is stored  in the memory.

Notice that first byte is the operation  code. Second  byte is  the low  order byte of the 16  bit data  address. Third  byte is  the high  order  byte of the  16 bit  data  address.

Note  :Low  order byte  of 16 bit address  is multiplexed  with data  bus  and requires de multiplexing  which requires additional  time. But  high  order  byte of  the address does not  require  de multiplexing  therefore  we write  low order byte  first. The  de multiplexing  is already  discussed in cahpter2.

Posted Date: 4/5/2013 2:56:15 AM | Location : United States







Related Discussions:- Three byte instruction , Assignment Help, Ask Question on Three byte instruction , Get Answer, Expert's Help, Three byte instruction Discussions

Write discussion on Three byte instruction
Your posts are moderated
Related Questions
advantages and disadvantages of thevenin theorem

Q. Aconical horn has a side viewas shown in Figure  The maximum value ofthe directive gain is given by GD ∼ = 5.13(D/λ) 2 , where D =√3.33λL1 and L1 = L/(1-d/D),in which d is the i

Explain the Synchronous Machines? A synchronous machine, unlike an induction (or asynchronous) machine, only develops torque at a fixed, so called, synchronous speed - n s whi

Refer to Figure 100. Assume MKS units. Given: R1= 4, R2=14, R3= 9, I4= 8, I5= 7. Determine: Ieq, Req, and V3.

Discuss the need of PCI bus. Peripheral Component Interconnect (PCI): It was developed by Intel and introduced in 1993 year. This is geared particularly to fifth- and sixth-

Can someone please guide me on how to compute a nash equilibrium in matlab

Parity flag  - Registers If after  any arithmetical or logical operation if  number of  the accumulator  are even  parity  flag (P)  is set otherwise  reset.

Q. (a) Determine the voltage at A in Figure . (b) With V i = 10 V, R 1 = 10 k, R 2 = 1000 , and A = 100, find the current i .

Q. A sectional view of a cylindrical iron-clad plunger magnet is shown in figure. The small air gap between the sides of the plunger and the iron shell is uniform and 0.25 mm long.

Q. Determine the Laplace transform for each of the following functions from the basic de?nition of Equation. (a) f 1 (t) = u(t) (b) f 2 (t) = e-at (c) f 3 (t) = df (t) dt,