Each of PIC16F877A microcontroller PORTB pins has an internal weak pull-up. A single control bit can turn on all the pull-ups. This is performed by clearing bit RBPU (OPTION_REG<7>). The weak pull-up is automatically turned off when the port pin […]
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This post shows an example of PIC16F877A PORTB interrupt on change (IOC). Four of the PORTB pins, RB7:RB4, have an interrupt-on-change (IOC) feature. Only pins configured as inputs can cause this interrupt to occur (i.e., any RB7:RB4 pin configured as
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The microcontroller PIC16F877A has one external hardware interrupt at pin RB0/INT. When an interrupt occurs, the microcontroller immediately executes the code attached with the interrupt, after finishing the interrupt code the microcontroller returns to the main code. This topic shows
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PIC16F877A buttons read This is PIC16F877A read inputs example. LEDs are going to be controlled using push buttons as shown in the circuit schematic below. PIC16F877A read inputs example circuit: Example circuit schematic is shown below. As shown in the
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PIC16F877A is a 40-pin (PDIP type) microcontroller which has 5 ports: A, B, C, D and E. From the 40 pins we can use 33 pins as an I/O pins. This microcontroller has 3 timers which are: Timer0: 8-bit timer,
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Each of the PORTB pins has a weak internal pull-up. A single control bit can turn on all the pull-ups. This is performed by clearing bit RBPU (OPTION<7>). The weak pull-up of a pin is automatically turned off when the
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PIC16F84A blink without delay (Timer0 interrupt) The microcontroller PIC16F84A has 1 timer which is Timer0, this timer has a resolution of 8 bits and an interrupt-on-overflow from FFh to 00h. This topic shows how to use Timer0 interrupt to blink
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PIC16F84A PORTB Interrupt on change This topic shows how to use PIC16F84A microcontroller PORTB change interrupt, this interrupt occurs when an input port changes its state. The pins responsible for this interrupt are RB4, RB5, RB6 and RB7. The compiler
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PIC16F84A External hardware interrupt example The microcontroller PIC16F84A has a unique external interrupt at RB0 pin (hardware interrupt). When an interrupt occurred, the microcontroller immediately executes the code attached with the interrupt, after finishing the interrupt code the microcontroller returns
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Interfacing PIC16F84A with push button This topic shows how to turn on and off 2 LEDs connected to PIC16F84A microcontroller, from Microchip, using 2 push buttons. The goal of this example is to see how to read the PIC16F84A inputs
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