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Microprocessor Articles
Page 2 of 42
Interfacing DAC with 8051 Microcontroller
In this section we will see how DAC (Digital to Analog Converter) using Intel 8051 Microcontroller. We will also see the sinewave generation using DAC.The Digital to Analog converter (DAC) is a device, that is widely used for converting digital pulses to analog signals. There are two methods of converting digital signals to analog signals. These two methods are binary weighted method and R/2R ladder method. In this article we will use the MC1408 (DAC0808) Digital to Analog Converter. This chip uses R/2R ladder method. This method can achieve a much higher degree of precision. DACs are judged by its ...
Read MoreInternal Data Memory Organization of Intel 8051
The internal data memory of 8051 is divided into two groups. These are a set of eight registers and a scratch pad memory. These eight registers are R0 toR7. The address range 00H to 07H is used to access the registers, and the rest are scratch pad memory. 8051 Provides four register bank, but only one register bank can be used at any point in time. To select the register bank, two bits of PSW (Program Status Word) are used.So the following addressing can be used to select register banks.Address RangeRegister Bank00H to 07HRegister Bank 008H to 0FHRegister Bank 110H to ...
Read MoreFlags register in 8085 Microprocessor
In 8085 microprocessor, the flags register can have a total of eight flags. Thus a flag can be represented by 1 bit of information. But only five flags are implemented in 8085. And they are:Carry flag (Cy), Auxiliary carry flag (AC), Sign flag (S), Parity flag (P), andZero flag (Z).The respective position of these flag bits in flag register has been show the below figure. The positions marked by “x” are to be considered as don't care bits in the flags register. The user is not required to memorize the positions of these flags in the flags register.Fig. Flags registerNow ...
Read MoreDifference between CALL and JUMP instructions
A CALL instruction is used to call a subroutine, while a JUMP instruction updates the program counter value and makes it point to another location inside the program. Read this article to learn more about CALL and JUMP instructions and how they are different from each other. What is a CALL Instruction? A CALL instruction is utilized to call a sub-routine. Using a CALL instruction, the program control is transferred to a location in memory that is not a part of the main program. A CALL instruction necessarily requires the initialization of a Stack Pointer (SP). It is basically ...
Read MoreDifference Between Multiprocessor and Multicomputer
Both multiprocessors and multicomputers are the types of parallel computing systems. The basic difference between a multiprocessor and a multicomputer is that a multiprocessor is a single computer system containing multiple processors interconnected with the common I/O and memory devices, whereas a multicomputer is a system consists of several autonomous computers connected in a network and each computer has its own I/O and memory devices, and other computing resources. Read through this article to find out more about multiprocessors and multicomputers and how they are different from each other. What is Multiprocessor? A multiprocessor is a data processing system that ...
Read MoreAdvantage of multiple chip select lines
Let’s consider that the EPROMs we have are having the starting addresses as 4000H, 4400H, …, 5C00H. 4000H in binary is 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0. In such a case, the 74138 has to be selected for the condition A15 A14 A13 = 0 1 0. This can be achieved by the connection shown in below figure which uses two invert gates.The procedure of selecting the chip74138 is denoted by the addresses A15 A14 A13 = 0 1 0 which can be implemented by any gates. We have taken ...
Read MoreGeneration of .HEX file using a linker
The file MULT.ASM which is created by using an editor is simply a text file. We cannot execute this file directly. At first we have to assemble the file, and then we have to link it. The step of assembly the translation of the program of assembly language to machine code requires the generation of a .OBJ file.Now a .HEX file is generated by using a linker. We have seen previously that how the naming of the input and output file is done.Input filenameThe source name of the file must be responded by the user. In the given example the ...
Read More8085 Program for subtraction of multi-Byte BCD numbers
Now let us see a program of Intel 8085 Microprocessor. In this program we will see how to subtract multi-Byte BCD numbers.Problem StatementWrite 8085 Assembly language program to subtract two multi-Byte BCD numbers.DiscussionThe numbers are stored into memory, and one additional information is stored. It will show us the Byte count of the multi-Byte BCD number. Here we are choosing 3-Byte BCD numbers. They are stored at location 8001H to 8003H, and another number is stored at location 8004H to 8006H. The location 8000H is holding the Byte count. In this case the Byte count is 03H.For the subtraction we ...
Read MoreDigital Integrated Circuits\\n
A microprocessor is digital is a digital circuit which is built using a combination logic functions. The microprocessor package contains an integrated circuit.Integrated CircuitAn integrated circuit is electronic circuit or device that has electronic components on a small semiconductor chip. It has functionality of logic AND or amplifying of a signal. These are mainly two types of circuits: Digital or Analog. Analog ICs handle continuous signals such as audio signals and Digital ICs handle discrete signals such as binary values.Types of Integrated CircuitsThere are different types of integrated circuits based various criteria. Based on intended application, the Integrated Circuit (IC) ...
Read MorePin diagram of 8212
We find 8212 available in nowadays as a package chip which is dual inline having 24 pins total. We find its functional pin diagram below.Fig: Pin diagram of 8212 functionalFig: Pin diagram of 8212Voltage of + 5 V is required for it to work based on the supply which is DC. The latch which is 8 bit in 8212 receives the information which is present on the eight data inputs ranging from DI7 to D10. The condition which helps in information latching is present on DI7 to DI0 depends on the state of logic of the pin which is of ...
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