2006-05-26
Using the PIC Timer modules of the PIC16F84A. This tutorial will teach you how to use the timers in this microcontroller using assembly language.
I was thinking of a loop which increments the value of register by 1 every time 4 goes in 10 until it becomes zero or indivisible (as in integer). 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 Instruction Register 8 Level Stack (13-bit) Direct Addr 8 Instruction Decode & Control Timing Generation OSC2/CLKOUT OSC1/CLKIN Power-up Timer Oscillator Start-up Timer Power-on Reset Watchdog Timer MCLR VDD, VSS W reg ALU MUX I/O Ports TMR0 STATUS reg FSR reg Indirect Addr RA3:RA0 RB7:RB1 RA4/T0CKI EEADR EEPROM Data Memory 64 x 8 EEDATA Addr 2017-11-19 · This blog is moved at new address MicroSim99 The following code demonstrate how to use timer-0 for clock generation or precise time delay. In this example external clock of 1Khz is used as a source for timer0.
Clearing bit T0SE selects the rising edge. 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 PWM Registers.
All MCU mostly use weak pull up resistors. 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. It should be made zero to activate it. This is done by OPTION_REG<7>=0. This specifically deals with the bit 7 leaving the other bits to its default values.
Both these registers are bit addressable. 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.
2012-09-15
INTCON is an interrupt control register.
When used, the prescaler should be assigned to the timer/counter by clearing the PSA bit of the OPTION_REG register. 2012-06-27
Using the PIC Timer modules of the PIC16F84A. This tutorial will teach you how to use the timers in this microcontroller using assembly language. The Timer0 module has an 8-bit register for the counts, the TMR0 register located in BANK0 and BANK2. This means that it can count up to 255. If the TMR0 value is 255 (0xFF) and it is increased once more, then the TMR0 register will become 0 (0x00) and the TMR0 interrupt shall be raised.
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The bits of the Option_Reg register as as follows: Bit #. 7. The OPTION register in the PIC 16f84 microcontroller is a readable and writable register which contains various control bits to configure the TMR0/WDT prescaler, the external INT interrupt, TMR0, and the weak pull-ups on PORTB. 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).
2019-11-10
The A/D in PIC16F877A has four registers.
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The controller offers a mechanism by which an 8-bit parallel bidirectional data transfer can be achieved between a PIC16F877A and other PSP supporting devices. The PIC16F877A's Port-D and Port-E are used in this data transfer. For this data transfer, Port-D is configured as a parallel slave port (PSP) by setting bit-4 of TRISE Register.
Why this statement " OPTION_REG = 0xC5; " is ok when I am writing to OPTION_REG register, but when I am using the next statements I get an error ? " RBPU not a member of a struct/union ". OPTION_REGbits.RBPU = 0; OPTION_REGbits.INTEDG = 0; OPTION_REGbits.T0CS = 0; OPTION_REGbits.T0SE = 0; 2020-04-13 · OPTION_REG. The OPTION_REG Register is a readable and writable register, which contains various control bits to configure the TMR0 prescaler/WDT postscaler (single assignable register known also as the prescaler), the external INT interrupt, TMR0 and the weak pull-ups on PORTB.