Sadly PIC16F877A does not have 3 external interrupts. So the best way to do it is use three digital pins for three pushbutton and combine the output of all thee button to the external INT pin. So when ever the button is pressed you can jump into the ISR and use the digital I/O pin to detect which particular button was pressed.

2018-07-13

This register contains the Timer0 overflow flag (TMR0IF) and corresponding Interrupt Enable flag (TMR0IE). PIC16F877A Timer Tutorial. As the name suggests these are used to measure the time or generate the accurate time delay. The microcontroller can also generate/measure the required time delays by running loops, but the timer relieves the CPU from that redundant and repetitive task, allowing it to allocate maximum processing time for other tasks.

Option_reg register in pic16f877a

We perform all the necessary settings with OPTION_REG Register. The size of the register is 8 bits. Click the link to explore the relevant bits of OPTION_REG Register Initializing the OPTION_REG register. The following is an example how we can initialize the OPTION_REG: Whether the interrupt occurs on the rising or falling edge of this clocking signal is determined by the state of the INTEDG bit in the OPTION_REG. SETTING the INTE bit allows an interrupt from the signal on RB0, CLEARING this bit disables the interrupt. 1 = Enables the RB0/INT interrupt 0 = Disables the RB0/INT interrupt .

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).

OPTION_REG Register. Fig. 4-2 OPTION_REG Register. RBPU - PORTB Pull-up enable bit.

Flaggor, register (variabler) och kon- stanter deklareras och förbereder start av program. För en mer detaljerad be- skrivning, se kodkommenteringen i appendix

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 PWM Registers. The below table shows the registers associated with PIC16F877A PWM. Register Description CCPxCON: This register is used to Configure the CCP module for Capture/Compare/PWM opertaion. CCPRxL: This register holds the 8-Msb bits of PWM, lower 2-bits will be part of CCPxCON register. 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.

TMR0 register holds the value to be incremented just like in 8051, where you have TH1-TL1 and TH0-TL0. The programmer must write into this register which will then be incremented till FFh. The structure of the OPTION_REG register. We perform all the necessary settings with OPTION_REG Register. The size of the register is 8 bits. Click the link to explore the relevant bits of OPTION_REG Register Initializing the OPTION_REG register.

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. REGISTERS FOR ADC USING PIC16F877A.
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PIC16F877A PWM Registers. The below table shows the registers associated with PIC16F877A PWM. Register Description CCPxCON: This register is used to Configure the CCP module for Capture/Compare/PWM opertaion. CCPRxL: This register holds the 8-Msb bits of PWM, lower 2-bits will be part of CCPxCON register.

In timer mode, the Timer0 mod- ule will increment every instruction cycle (without pres- caler). If the TMR0 register is written, the increment higher bit numbers: the PIC16F877A has two 8-bit and one 16-bit timers while the PIC18F4550 The PIC16F84A datasheet describes this register as follows:. Timer0 Registers.

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The OPTION_REG register contains various control bits to configure Figure below shows a common way of connecting PIC microcontroller that uses EUSART

Share:. It is PIC16F877 CPU, soory it's a PIC16F887 with 20MHz cristall, and I have an own PCB Timer0 settings TMR0 = 107; // Initialize Timer0 register INTCON. Lista på registeruppsättningen i PIC16F877A Datablad TTL-kretsar 74-serien 1 s bcf OPTION_REG,T0CS ;Koppla intern clk till timer bcf OPTION_REG,PSA Lista på registeruppsättningen i PIC16F877A Datablad TTL-kretsar 74-serien · Tentamen Timer Se option_reg (skriv bara option, i C) för konfigurering.

GPIO in PIC16F87XAFor program - https://goo.gl/GwcGlvGPIO in PIC16F877A is divided into 5 ports that is PORTA, PORTB, PORTC, PORTD, PORTE. We can configure a

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). 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.

Bits 0, 1 and 2 are the three prescaler division ratio bits for either the timer/counter module or the watchdog timer WDT, 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). The register associated with Timer0 is the option_reg, TMR0 register, and INTCON register. TMR0 register holds the value to be incremented just like in 8051, where you have TH1-TL1 and TH0-TL0. The programmer must write into this register which will then be incremented till FFh. OPTION_REG I have learned that the maximum 'delay' possible in pic16f877a running with a source of 11.0592MHz (11059200 / 4 actually) is 23 ms.. without using software delays (delay_ms( )).. the calculation was max_delay = ((FF-00)xPrescalarxTimeperiod) = (255x256x3.62xe-7) = ~23ms..