2017-11-19

Hi to all, I am New to PIC In PIC16F877A few Special Functional Registers(SFRs) have more than one address, why so example : Status Register (Addresses are 03h,83h,103h,183h) OPTION_REG REGISTER (ADDRESSES are 81h, 181h) and INTCON REGISTER (ADDRESSES are 0Bh, 8Bh, 10Bh, 18Bh). my

bit 3: Timer 1 has a register called TMR1 register, which is 16 bits of size. The below table shows the registers associated with PIC16f877A Timer 1 module. Structure of T1CON : Bit 7 and Bit 6 (unimplemented) : Read as ‘0’ T1CKPS1:T1CKPS0 (Timer1 Input Clock Prescale Select bits) 11 = 1:8 prescale value 10 = 1:4 prescale value 01 = 1:2 prescale value PIC16F877 Ports and Registers. This article is a part of our Tutorial on PIC16F877, where this section focuses on the Input/Output ports and TRIS registers of PIC16f877. For Previous Articles, follow the links below: TAKE A LOOK : INTRODUCTION TO PIC 16F877. TAKE A LOOK : PIC 16F877 – ARCHITECTURE AND MEMORY ORGANIZATION All MCU mostly use weak pull up resistors.

In this example external clock of 1Khz is used as a source for timer0. Now see servo motor expects a pulse every 20ms and width of the pulse varies from 1ms to 2ms. 1ms for maximum rotation in one direction lets say -90 and 2ms for +90 , these are general assumptions but vary slightly with every motor so using hit and trial method calculate the pulse width for you own motor.These pulses are generated by microcontroller and I have used PIC16f877a but any other Using the PIC Timer modules of the PIC16F84A. This tutorial will teach you how to use the timers in this microcontroller using assembly language. Register Description OPTION_REG: This registers is used to configure the TIMER0 Prescalar, Clock Source etc TMR0 : This register holds the timer count value which will be incremented depending on prescalar configuration INTCON: This register contains the Timer0 overflow flag(TMR0IF) and corresponding Inetrrupt Enable flag(TMR0IE). INTEDG bit of OPTION_REG Register is the Interrupt Edge Select bit. When it is 1 interrupt is on rising edge of RB0/INT pin and when it is 0 interrupt is on falling edge of RB0/INT pin.

The bits of the Option_Reg register as as follows: Bit #.

PIC Microcontroller PIC16F877A LED Blinking Sequence Code and Working Explanation: In order to activate this in our PIC MCU we have to look into our data sheet for the OPTION_REG (option register) as shown in the snapshot below. As shown the bit 7 deals with the weak pull up resistor.

This article is a part of our Tutorial on PIC16F877, where this section focuses on the Input/Output ports and TRIS registers of PIC16f877. For Previous Articles, follow the links below: TAKE A LOOK : INTRODUCTION TO PIC 16F877. TAKE A LOOK : PIC 16F877 – ARCHITECTURE AND MEMORY ORGANIZATION In this tutorial we will learn how to use an External Interrupt in PIC Microcontroller and why/where we will need them. This is a part of the sequence of PIC Tutorials in which we started learning PIC Microcontrollers from scratch; hence this tutorial assumes that you are familiar with how to program a PIC MCU using MPLABX and how to interface an LCD with PIC. 2003 Microchip Technology Inc.DS39582B-page 23PIC16F87XA2.2.2.2OPTION_REG RegisterThe OPTION_REG Register is a readable and writableregister, which contains various control bits to configurethe TMR0 prescaler/WDT postscaler (single assign-able register known also as the prescaler), the externalINT interrupt, TMR0 and the weak pull-ups on PORTB.

Timer 1 has a register called TMR1 register, which is 16 bits of size. The below table shows the registers associated with PIC16f877A Timer 1 module. Structure of T1CON : Bit 7 and Bit 6 (unimplemented) : Read as ‘0’ T1CKPS1:T1CKPS0 (Timer1 Input Clock Prescale Select bits) 11 = 1:8 prescale value 10 = 1:4 prescale value 01 = 1:2 prescale value

Initializing the OPTION_REG register. The following is an example how we can initialize the OPTION_REG: 1. timer0 in pic16f877a. PIC16F877 Timer Modules tutorials - Timer0 Many times, We progressed with our project by displaying some text on 1602A LCD display using PIC16F877A and work with MPU6050 saved in the register. we used OPTION_REG register. We. used movlw 0xD4 The PIC16F877A has 8K (8096 x 14 bits) of Flash ROM program memory which can be programmed via the serial programming pins PGM, PGC, and PGD. The instruction for the program contains the operation code (opcode) and operand (immediate data, literals, register address, jump address).

Each of the PORTB pins has it's own pull-up resistor. Especially, PIC16F877A libraries are not available in this compiler. Therefore, we have to write the code from register levels of CCP1 and CCP2 modules. These are the registers that used to configure CCP1 and CCP2 modules of PIC16F877A microcontroller. Timer mode is selected by clearing bit T0CS (OPTION_REG<5>).
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PIC16F877A Timer0 interrupt: The TMR0 interrupt is generated when the TMR0 register overflows from FFh to 00h. The below table shows the registers associated with PIC16F877A Timer0 module. Timer Calculation To calculate the time the Oscillator frequency we need divided by 4 and then fed to the controller, and divide further by prescaler to generate the range of delays.

PIC16f877a finds its applications in a huge number of devices. It is used in remote sensors, security and safety devices, home automation and many industrial instruments. An EEPROM is also featured in it which makes it possible to store some of the information permanently like transmitter codes and receiver frequencies and some other related data. The below table shows the registers associated with PIC16f877A Timer0 module.
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Jan 10, 2001 Company are registered trademarks of Microchip Technology PIC16F877A 14.3K The OPTION_REG Register is a readable and writable.

Feb 9, 2010 OPTION_REG REGISTER. The OPTION_REG register is a readable and writable register which contains various control bits to configure. the OPTION_REG register is toggled, so that an inter- rupt occurs on every zero- crossing. Using the following equation, it is possible to calculate when the pin Jun 20, 2017 2.

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2018-08-19

REGISTERS FOR ADC USING PIC16F877A. Most of the configurations to set up the ADC has to be done in the ADCON register. The ADCON register is the Control Register of the ADC. The ADC conversion is given in the user manual of PIC16F877A.