Hi,

Back to PIC, I've got some questions:

1- In the PIC name PIC16F628-20/P, what is 20/P stand for? Speed or memory?

2- Is it possible to run more than one Delay subroutine at the same time for different parts of the program?

3- Can i assign all the PIC16F628A pins as output ( except for VCC & Gnd )

4- In my programmer, the ICSP pins are marked with the pin names, do I have to connect them directly to the PIC pins ( If I want to do in circuit programming )

Thanks

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Its what your friend in Your mind, what you in your friends mind

 

20 = 20MHz
P = Plastic
I = Industrial

2. yes, you'll probably need timers / interrupts.

3. No MCLR (RA5) is input only, RA4 may be open collector output on some PICs

4. yes you connect directly to the PIC pins for ICP

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

Thanks for your fast reply, I'm using 16F628A can i ask for more:

Is this maximum i can drive it externally? because i knew that its internal Clock is 4MHz ( Thanks to N.Goodwin ) am i right ?


software or hardware ?

so maximum of 14 outputs can be used ?

With the circuit supply ON?

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Its what your friend in Your mind, what you in your friends mind

 

20MHz is the maximum clock frequency for the 16F628A

Timers and interrupts are all built in peripherals. So you just program them to work the way you want them to. You can simulate timers & interrupts with the MPLAB simulator.

15.5 outputs, the open collector is still an output but it can only pull low.

It can have its own power or depending on the programmer the programmer may supply power.

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

what about overclocking it with bigger crystal?

 

Works fine, but don't count on it working on every chip, or being reliable.
http://www.google.ca/search?q=pic+overclocking

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Futz's Microcontrollers & Robotics
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Better to use a fater PIC. How much did you plan to overclock it by?

__________________
Bill
Smart Kits build Smart People
http://www.blueroomelectronics.com

 

about 5 MHz

 

Try it and see. It won't hurt anything. All that can go wrong is that it might not work. It will run a bit warmer and consume a little more current. Neither will likely be a problem.

EDIT: Just tried a 25MHz on my 16F877 with the GLCD. No go. Went back to the 20MHz and it's happy again. The 25 might need different caps or some small changes to the program. I didn't test, as I'm busy doing different things right now.

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Futz's Microcontrollers & Robotics
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