Contents
How to configure internal oscillator of PIC?
The Internal Oscillator is enabled by one of two methods: Set the Fosc bits in a configuration register to select the internal oscillator. Set the SCS bits in the OSCCON register to select the internal oscillator. The OSC1 and OSC2 pins are available as general purpose I/O when the internal oscillator is selected.
Does PIC16F877A have internal oscillator?
The PIC6F877A does not have an internal oscillator.
What is Osccon register?
The OSCCON register controls the system clock and frequency selection options. It contains the following bits: frequency selection bits (IRCF2, IRCF1, IRCF0), frequency status bits (HTS, LTS), system clock control bits (OSTA, SCS).
Which functions are set through configuration word in PIC16F877A?
Configuration bits in PIC16F877A
- Oscillator Configurations.
- Watchdog Timer (WDT)
- Power-up Timer (PWRT)
- Brown-out Reset (BOR)
- Low Voltage (SINGLE SUPPLY) ICSP.
- Data EEPROM Memory Code Protection bit (CPD)
- Flash Program Memory Write Enable bit.
- Flash Program Memory Code Protection bit.
Which bits of the register A is used for turning on the oscillator?
Explanation: In DS12887, D4-D6 bits of register A are used to turn on the oscillator. A specific value of 010 of D4-D6 is desirable for turning on the oscillator.
How to configure the oscillator on a PIC chip?
Configuring the oscillator on a PIC chip requires us to call some specific instructions and configure specific configuration bits. This will be different depending on the PIC you use, so the code in this article will only consider the PIC16F819.
How to get started with PIC microcontrollers?
The next step is to set the speed of the oscillator. Since the PIC does instructions in steps, and these steps occur on pulses from the oscillator, a faster oscillator will result in a faster PIC, which means it will be able to perform more instructions per second.
Where to put configuration code in PIC program?
Most PIC programs will have a block of configuration code at the very top of the main.c file. Most of this will not be covered until it becomes relevant, but it is important that you put the same code (seen below) in your main.c file.