Tagged Questions
2
votes
0answers
56 views
PIC16F877A latchup/glitching
I have a PIC16F877A microcontroller with a 19.6608 MHz crystal, wired for 12V ICSP. I can reprogram the chip just fine, and it runs almost flawlessly (it's blinking an LED right now as I type). Only ...
2
votes
1answer
65 views
Can I dynamically change the input clock frequency of the AT91SAM3X8E?
Background:
I'm attempting to use an AT91SAM3X8E microcontroller (for Arduino Due compatibility) to create a USB to \$I^{2}S\$ interface. Most \$I^{2}S\$ CODECs require a master clock that is ...
1
vote
1answer
228 views
How to change the frequency of PIC internal oscillator?
Internal oscillator of PIC16f884 doesn't change frequency in the following code:
...
3
votes
1answer
86 views
PIC18 with ACT HC49/US XTAL
As part of my current project I need to ensure that my MCU (namely PIC18F4520) runs smoothly, minimizing the possibility of any interruptions. The datasheet ...
3
votes
1answer
185 views
Does Fosc refer to the crystal frequency before or after PLL is applied for PIC18 microcontrollers?
If I have a PIC18 microcontroller with an 8MHz crystal and 4xPLL, is Fosc 8MHz or 32MHz?
6
votes
2answers
641 views
Sharing an oscillator between two ICs
I have a microcontroller and an FPGA on the same board. If they're both going to run at the same clock speed, can I just use one oscillator to clock them both? There seems like there is something I ...
0
votes
1answer
113 views
what is the default internal clock for pic16f1946?
While going through the data sheet, section 5.3.1 says: "Default system oscillator determined by FOSC bits in Configuration Word 1". How can find the value of this default clock, is it 8MHz or 31khz?
...
2
votes
3answers
3k views
Do PIC micorcontrollers NEED an external oscillator?
I'm trying to write my first and a simple program on a pic16LF84, but I'm confused as to whether an external oscillator is required or optional.
I'm reading a pdf called "Book: PIC Microcontrollers ...
3
votes
7answers
1k views
Using microcontroller as oscillator for high voltage power suppy?
MightyOhm has designed a geiger counter which is here. I am not very clear but I think he is using the 555 timer as an oscillator in the high voltage power supply section. I've attached his schematic ...
4
votes
4answers
2k views
Internal or external oscillator
I always use the internal oscillator that pics have as I have never found the need to run anything at higher frequency than 8 MHz (which is the fastest the pics I use tend to be able to go). Are there ...
1
vote
1answer
350 views
create oscillator with variable frequency by computer
How can I use my computer to control the frequency of a variable oscillator?
THANK YOU.
