Microprocessor and microcontroller: Aseembly language programs

PWM with 89S52

2010-03-10T02:36:00.000-08:00

Here is the program for Pulse width modulation PWM on basic for 89s52.You could generate pwm using the following psedocode#define high_period #define low_period main(){!!Code to initiate the timer;!!Timer counter register value = high_period;!!set port pin high!!start timerwhile(1);}interrupt void time_interrupt_routine(void){if(port pin is high)!!Timer counter register value = low_period;else!!

How to access R0 to R7 registers in Keil C?

2010-03-05T02:31:00.000-08:00

you can use the following Program to access R0 to R7 registers in Keil C{unsigned char R0Val;_asmMOV A, R0MOV _R0Val, A_endasm}OR{unsigned char R0Val;#pragma ASMMOV A, R0MOV _R0Val, A#pragma ENDASM}C variables have to be prefixed by '_' or underscore character, to be accessible in the assembly section of the C code.Hope this helps.

Program to initialise the LCD in 4 bit mode using PIC microcontroller

2010-02-28T02:25:00.000-08:00

It was for 16F72 at 4Mhz written in cc5x. LCD is connected to PORTB.RS at RB7,RW at RB1,EN at RB6. DB7 at RB2,DB6 at RB3, DB5 at RB4, and DB4 at RB5. A function delay_ms() is used , which is not shown here.code will work for 2x16 character LCD modules.void lcdw(unsigned char m){PORTB.2=m.7;PORTB.3=m.6;PORTB.4=m.5;PORTB.5=m.4;en=1;nop();nop();en=0;}void nbw(unsigned char m){PORTB.2=m.7;PORTB.3=m.6

Program for multiplexing of led displays for pic microcontrollers

2010-02-25T02:05:00.000-08:00

Suppose you want to design the ac digital voltmeter rang up to 0-300v or above, by using any pic 8-bit mcu, and want to use 3, 7-segment display for it then there can be a problem as to how do you indicate such large value on displaythen you can go with the following approchuse BCD to 7 segment converter, so that only 4 bits can be used to control a single 7 seven segment display..... so in

version control system for keil & MPLAB.

2010-02-20T01:53:00.000-08:00

Hi when you are working on large project which involve large number of programs and many developers work at same thing then thing will become hard to manage and the project may Fail.so when you are dealing with Such kind of progects while developing Microprocessor microcontroller Projects it is all ways better to use CVS Code version system or Version control sytems.It is the best way to share

LED blinking program for Pic microcontroller

2010-02-17T01:42:00.000-08:00

Here is the program for Pic microcontroller PIC16F877A to blink a LED connected to B3 of PORTC,This program works for Mplab. or using HiTECH PRO Lite compiler.PICClite code may be#include #include "delay.h"#define _XTAL_FREQ 4000000_CONFIG(MCLREN & UNPROTECT & BORDIS & WDTDIS & PWRTEN & INTIO);void main(){TRISC=0;while (1){PORTC = 8;DelayMs(250);DelayMs(250);PORTC = 0;DelayMs(250);DelayMs(250);}

A microprocessor Program to convert BCD pack and Unpack number for 8085.

2010-02-13T01:13:00.001-08:00

Please find the Below program to Pack the two unpacked BCD numbers stored in memory locations 4200H and 4201H and store result in memory location 4300H. Assume the least significant digit is stored at 4200H.Here is the Sample problem:(4200H) = 04(4201H) = 09Result = (4300H) = 94Source program for the above logicLDA 4201H : Get the Most significant BCD digitRLCRLCRLCRLC : Adjust the position of

How to measure + and - 5 Volts using PIC microcontroller PIC1F4550

2010-01-10T06:06:00.000-08:00

This post will explain you how to measure postitive and Negative 5 voltage using PIC microcontroller PIC1F4550First config the ADC channel in your controller and in the ADCON Registers you have an option to select +Vref & -Vref values. say ADC is 10bit resolution i.e. 2^10 you will get max count from 0 to 1024. so the count "0" indicates your -Vref (-5v) value, count "512" indicates the 0V and

Dely loop in AVR

2009-10-15T10:23:00.000-07:00

Amer: Hello freinds.Can anybody help me regarding how to write a assembly language delay loop (loop-in-loop method no use of internal timers) for AVR microcontroller and how to evaluate the time delay provided by a loop?I have an example of such loop taken from EFY mag's Nov.05 issue. You can help me by explaining the calculations for that code. The code goes as follows:-delay: clr r19ldi r17,$

C Programming Options in AVR

2009-10-13T10:18:00.000-07:00

I am new to AVRsI want to know what all programming options are there for C.I know about BASCOM, but dont personally like BASIC that much.ans:* hey try codvisionavr c compiler .....it good and easy to learn and when u become pro useWinAVR GCC* I think you should see the page http://www.lancos.com and everthing will be clear! U will be able to make ur own circuit to program downloader circuit! as

How To to build an ISP for Atmega 128

2009-10-05T11:44:00.000-07:00

You can check out Electronics For You Vol 31 nov 2005 editionorFirst of all ATMEGA 128 supports ISP. One can use the same ISP programmer used for ATMEGA 16/32 to burn a ATMEGA 128. In your target platform just take out the connections for SPI, (MISO, MOSI, SCK, and RESET) and connect those line to your ISP programmer. For schematic and PCB layout mail me : nibir.chakraborty@gmail.com. You can

ADC on LPC2129

2009-06-08T19:35:00.000-07:00

Here goes the second post on " How to program the onboard adc in LPC2129" As said earlier LPC2129 has 4 onboard 10-bit ADC. Also these ADC's are internally multiplexed. So here i give out a snippet of how you could access the ADC's on LPC21xx.At the time of writing this post,i dnt believe that any further explanation is needed . In case you need please refer to the end of line comment or feel

hola ! ARM

2009-05-28T04:10:00.000-07:00