Each instruction has a one-byte (8-bit) operation codes or opcode. With 8- bit binary opcode, a total of different operation codes can. Intel instruction set. x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, xA, xB, xC, xD, xE, xF. 0x, NOP 1 4 , LXI B,d16 3 10 , STAX B 1 7 , INX B 1 6 –K 1 1 ADDRESSING MODES OF Shown in the following are the sizes of a 5CH This can be verified from the opcode chart given in the previous chapter.
|Published (Last):||25 March 2014|
|PDF File Size:||10.86 Mb|
|ePub File Size:||14.38 Mb|
|Price:||Free* [*Free Regsitration Required]|
In program 2, bit addition instruction DAD is used. Confused about the binary code for the MVI instruction in the instruction code. Encoding the target register inside the instruction bits is very common.
Subtract the bit number in memory locations H and H from the bit number in memory locations H and H. Add the bit number in memory locations H and H to the bit number in memory locations H and H. Write a set of instructions to alter the contents of flag register in Or is it that this entire opcode is predefined and you can’t chrat the “MVI” and “target register” in the opcode?
Exchange the contents of memory locations Statement: Store the result in memory locations H and H with the most significant byte in memory location H. Terminate program execution NOTE: I was in my foolishness, was desperately trying to separate the opcode into two parts sequentially! I hope my cgart makes sense lol. Write a program to shift a 16 bit data, 1 bit right.
Instruction Set Manual: Opcodes
Email Required, but never shown. Assume the least significant digit is stored at H. The most significant eight bits of the two numbers to be added are in memory locations H and H.
Add the contents of memory locations H and H and place the result in the memory locations Hand H. Assume that data 80885 in BC register pair. Assume data is in register C.
Exchange the contents of memory locations H and Opcodf. Add two 8-bit numbers Statement: Read the program given below and state the contents of all registers after the execution of each instruction in sequence.
Write a program to shift an eight bit data four bits right. Store I6-bit result in memory locations H and H.
MVI is 0x00xxx where xxx encodes one of 8 possible registers. In program 1 direct addressing instruction is used, whereas in program 2 indirect addressing instruction is used.
The first byte being 3E in hexadecimal and the second byte being chary in hexadecimal. The most significant eight bits of the two numbers are in memory locations H and H.
Opcodes of 8085 Microprocessor
Sign up using Facebook. Sign up or log in Sign up using Google. Post as a guest Name. How does “3E” tell the microprocessor both the information? The result of both programs will be the same.