General question about PIC18Fxxxx?

[miniElectronics]

Hi,

I have been working with Atmel AVR's. And want to switch over to PIC.

1. If i choose a PIC18F13K22 chip as example. Do i need an external oscillator to use this?

2. I put up a PIC18F13K22 on Proteus and programmed it to output 2 LED to high on PORTC. But when i tested so it only show 1 LED as high. Do you know what is reason?

3. Does this mean that this chip have a limited execution of process such as it can't output 2 pins as High?

Best Regards

 

[Nigel Goodwin]

The specs clearly explain the oscilaltor:

Precision 16 MHz internal oscillator block:
– Factory calibrated to ± 1%
– Software selectable frequencies range of 31 kHz
to 16 MHz
– 64 MHz performance available using PLL
– No external components required
■ Four crystal modes up to 64 MHz

If only one LED is going high you've made an error somewhere, check the datasheet and make sure you've got that pin set as a digital output.

 

[atferrari]

Or a LED connected backwards.