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Microprocessor Articles
Page 33 of 42
8085 Program to perform bubble sort in ascending order
In this program we will see how to sort a block of bytes in ascending order using bubble sorting technique.Problem StatementWrite8085 Assembly language program to sort numbers in ascending order where n number of numbers are stored in consecutive memory locations starting from 8041H and the value of n is available in memory location 8040H (Using BUBBLE sort).DiscussionIn this program we will arrange the numbers in bubble sorting technique. In this sorting technique, it will be executed in different pass. In each pass the largest number is stored at the end of the list. Here we are taking the numbers ...
Read More8085 Executing the program and checking result
In this section we will see how to use 8085 to write a program in 8085 kit. We will also see how to debug the program and check the result after successful execution. Let us see a typical keypad structure of 8085 kit. (This keyboard pattern may vary indifferent kits of different manufacturers)The following table will show the functionalities of different control keys. There are 16alphanumeric keys (0-9, A-F) to provide data and address −KeysFunctionalitiesRESETReset the systemVCT INTVector Interrupt. It generates hardware interruptRST 7.5 via keypadSHIFTProvides second level commands to all keysGOExecute the programSIExecute in Single Step ModeEXREGExamine Register. It allows ...
Read More8085 Program to Exchange 10 bytes
In this program we will see how to exchange a block of 10-byte data using 8085.Problem StatementWrite 8085 Assembly language program to exchange a block of data, where block size is 10.DiscussionThe data are stored at location 8010H to 8019H and 9010H to 9019H. The location 8000H is holding the number of bytes to exchange. In this case number of bytes are 10D so it will be 0AH.The logic is very simple, The HL and DE register pair is pointing the first and second data block respectively. By taking the data we are just swapping the values of each memory ...
Read More8085 Program to compute LCM
Now let us see a program of Intel 8085 Microprocessor. This program will find the LCM of two8-bit numbers.Problem StatementWrite 8085 Assembly language program to find LCM of two 8-bit numbers stored at location8000H and 8001HDiscussionIn this program we are reading the data from 8000H and 8001H. By loading the number, we are storing it at C register, and clear the B register. The second number is loaded into Accumulator. Set DE as the 2's complement of BCregister. This DE is used to subtract BC from HL pair.The method is like this:let us say the numbers are 25 and 15. ...
Read More8085 Program to multiply two 2-digit BCD numbers
Now let us see a program of Intel 8085 Microprocessor. This program will find the multiplication result of two BCD numbers.Problem StatementWrite 8085 Assembly language program to find two BCD number multiplication. The numbers are stored at location 8000H and 8001H.DiscussionIn this program the data are taken from 8000H and 8001H. The result is stored at location 8050H and 8051H. As we know that 8085 has no multiply instruction so we have to use repetitive addition method. In this process after each addition we are adjusting the accumulator value to get decimal equivalent. When carry is present, we are incrementing the ...
Read More8085 program to find maximum and minimum of 10 numbers
In this program we will see how to find the maximum and minimum number in a block data.Problem StatementWrite 8085 Assembly language program to find the maximum and minimum number in a block often 8-bit numbers.DiscussionIn this program we are taking the first number of the block into register D and E. The D will store the minimum number, and E will store maximum number. In each iteration we will check whether the number is smaller than D or not, if it is smaller, then update D with the new number, and then compare it again with E to check ...
Read MoreProgrammer's view of Z-80
In this section we will see the basic architecture of the Z-80 Microprocessor, and different registers to write programs into it.To write programs we have to care about the registers and some instructions to access them during program execution.From this diagram it is clear that there are some special purpose registers like W, Z, some other registers like Stack Pointer (SP), Program Counter (PC) etc. three general purpose register pairs (BC, DE, HL) and Accumulator A. There is also an 8-bit flag register to hold the flag bits. Up to this, it is like the 8085 architecture, but in Z-80, ...
Read MoreSpecial features of Z-80
In this section we will see some advanced features of Zilog Z-80 Microprocessor. These features are basically compared to the Intel 8085 Microprocessor.The features are listed below −Sr.No.Features & Description1Opcode CountIn this Microprocessor there are 698 Opcodes of different lengths.2Instruction LengthThe instructions can be divided into four categories according to their lengths.There are 202 of 1-byte instructions, 344 of 2-byte instruction74 of 3-byte instruction78 of 4-byte instruction3Opcode LengthThe instructions can also be divided into two parts according to the opcode length. In the instruction set, there are instructions with 1-byte opcode and 2-byte opcode.The number of 1-byte opcode instruction is ...
Read MoreExchange of blocks in Z-80
In this section we will see how we can use the Zilog Z-80 Microprocessor to Exchange the contents of each element from two different blocks.The number of items in each block are given at location 5000H, and the blocks are at position 5050H and 5070H.So before swapping the items in the memory is looking like thisAddressValue5000H04H...5050H89H5051H7AH5052H2FH5053H56H...5070HAFH5071HA9H5072HFBH5073H21H...Now, we are writing a program at location 8000H to exchange the block contents.ProgramAddressHex CodesLabelsMnemonicsComments800021 00 50LD HL, 5000HLoad the HL pair with 5000H8003DD 21 50 50LD IX, 5050HSet the index register with 5050H8007DD 7E 00LD A, (IX+00H)Load Acc with IX + 00H800ADD 46 20LD ...
Read MoreComparison of Intel 8080 with Intel 8085
The Intel 8080 microprocessor was the predecessor of the 8085 or the Z-80 microprocessors. It was designed and manufactured by Intel. This Microprocessor was released on April 1974. It was an 8-bit Microprocessor.The Intel 8085 is also an 8-bit Microprocessor, which was introduced in 1976. It is very close to the 8080 microprocessor, but some slight changes and modifications are present. The Zilog Z-80 was also introduced in 1976. Basically, the Intel team was divided and formed a new Group called Zilog. The Zilog team was introduced the Z-80 Microprocessor.The 8080 MicroprocessorIn this diagram, we can see that the 8080 ...
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