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Microcontroller Articles
Page 24 of 33
I/O-mapped I/O or memory-mapped I/O in 8085 Microprocessor
Before having a discussion regarding the demerits or merits of I/O mapped I/O and memory-mapped I/O, let us have a generic discussion regarding the difference between I/O mapped I/O and memory mapped I/O.In Memory Mapped Input Output −We allocate a memory address to an Input-Output device.Any instructions related to memory can be accessed by this Input-Output device.The Input-Output device data are also given to the Arithmetic Logical Unit.Input-Output Mapped Input Output −We give an Input-Output address to an Input-Output deviceOnly IN and OUT instructions are accessed by such devices.The ALU operations are not directly applicable to such Input-Output data.So as ...
Read MoreProgram for simulation of throwing a die in 8085 Microprocessor
Write an 8085 assembly language program to simulate the throw of a die using an interrupt.We have a counter for this program, which counts the ranges from 1 to 6, and again repeats the sequence of count in a matter which is endless in an infinite loop. The die throwing getting the head and tail probability gets simulated by pressing the key ‘Vect Intr’ on the keyboard. The branching of 8085 branches to RST7.5 ISS. Here, the current value of the counter gets is displayed in the data field, which controls and returns to the main program for the continuation ...
Read MoreProgram for simulating a stopwatch in 8085 Microprocessor
We write an 8085 assembly language program just to simulate a stopwatch for displaying minutes and seconds in the address field. There exists a provision to stop the stopwatch, along with the display for continuation to show the time just previous to the stop command.FILE NAME STOPWACH.ASM PRESSING THE ‘VECT INTR’ KEY STOPS THE STOPWATCH, WITH STATIONARY DISPLAY ORG C000H CURAD: EQU FFF7H UPDAD: EQU 06BCH RESET: LXI H, 0000H REPEAT: SHLD CURAD CALL UPDAD; Display time present in HL in the address field MVI A, 00011011B SIM ; Unmask RST7.5, Reset RST7.5 flip flop EI ; Enable interrupt ...
Read MoreControl port of 8255
In 8255, there are two types of command words or control word are available. And they are −Mode definition control word andPort C bit set/reset control word.Both these are written to the control port only. From the point of view of the microprocessor there is a single 8-bit control port, which is selected when CS* = 0, WR* = 0, A1 = 1 and A0 = 1. But if we consider the architecture of 8255, internally there are two control ports, one for mode definition control and another for Port C bit set/reset control. The contents of the control port ...
Read MoreProgram for adding 2 numbers input from keyboard in 8085 Microprocessor
We write an 8085 assembly language program of two input using two 2-digit hexadecimal numbers from the keyboard and then we add and the output results in the address field.FILE NAME ADD2NUM.ASM ORG C000H CURAD: EQU FFF7H UPDAD: EQU 06BCH CLEAR: EQU 044AH GTHEX: EQU 052FH MVI A, 0EH SIM EI ; Unmask RST5.5 and enable interrupts MVI B, 01 CALL GTHEX ; Input a 2 digit number and display in data field MOV A, E STA C100H ; Store the 2-digit hex number in C100H MVI B, 01 CALL GTHEX ; Input a 2 digit number and display in ...
Read MoreProgram for adding 4 hex digits of a 16-bit number in 8085 Microprocessor
We write an 8085 assembly language program for the addition of 4 hex digits of a 16-bit number whose input is given from the keyboard and the result is displayed in the data field.FILE NAME ADDHEX.ASM ORG C000H CURDT: EQU FFF9H UPDDT: EQU 06D3H GTHEX: EQU 052FH HXDSP: EQU 05A1H OBUFF: EQU FFFAH MVI A, 0EH SIM EI ; Unmask RST5.5 and enable interrupts MVI B, 00 CALL GTHEX ; Input a 4 digit number and display in address field CALL HXDSP ; Store the 4 hex digits in 4 locations starting from OBUFF LXI H, OBUUF MOV A, M ...
Read MoreMode 1—strobed I/O
We call mode 1 as the strobed Input Output or handshake Input Output. We use this mode when the data is supplied by the input device to the microprocessor at irregular interval of time. A port which is functioned to program in mode uses three handshake signals. These handshake signals are provided by Port C. Only port A and B works in mode 1. The pins PC2, PC1, and PC0 provides handshake signals for port B when we configure it for Input port or Output port. Moreover, the pins PC7, PC6, and PC3 provides handshake signals for port A. The ...
Read MoreInterfacing 7(Seven) Segment Display to 8085 Microprocessor
An output device which is very common is, especially in the kit of 8085 microprocessor and it is the Light Emitting Diode consisting of seven segments. Moreover, we have eight segments in a LED display consisting of 7 segments which includes ‘.’, consisting of character 8 and having a decimal point just next to it. We denote the segments as ‘a, b, c, d, e, f, g, and dp’ where dp signifies ‘.’ which is the decimal point. Moreover, these are LEDs or together a series of Light Emitting Diodes. We have shown the internal circuit comprising of a display ...
Read MoreMode 2—bi-directional I/O
In mode 0 or mode 1, a port works as an input port or an output port. It is dependent if an input device or an output device gets connected to the port. Moreover, this, mode 2 is often called as bi-directional handshake Input Output. It is beneficial for us when the microprocessor receives information, and sometimes sends information to the Input Output device which is connected to 8255. An example to be cited as for the communication process with a floppy disk controller card. Since mode 2 is bi-directional handshake Input Output, it needs more number of handshake lines ...
Read MoreDisplay interface using serial transfer in 8085 Microprocessor
In this module we have explained the complete interface of four numbers segmented into seven parts having the Light Emitting Diode which uses a serial data transfer scheme. The portion which is displayed of the interface has 4 LEDS comprises of 7-segments LEDs as we can see from the physical layout of the interface. The connection to the interface is done by the ALS-8085 kit which uses a flat table of 26 crores. We connect the connector C1 to the interface to the Input Output connector P3 on the ALS kit. There is a power supply of of +5 V ...
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