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Thanks PCM.
Looks like the only time that i can configure RE3/VPP as an output is when I am NOT using ICSP!

I managed to dig up an old email from an Arrow FAE on some VPP issues:

Mike,

...

I am currently using a PIC18F458 whose VPP pin was designated as "VPP/MCLR" and could NOT be used as an i/o pin. Then came the next generation of PICs: PIC18F4580, where the pin can now be d ...

Thanks everyone. I just placed the order for Jan Axelson's USB Complete, 3rd ed.

I checked out the 2nd edition from the library, and I seem to see better reviews for the 2nd edition than the 3rd e ...

Pardon me if this has been mentioned in one of the earlier replies, but...

Isn't CLKOUT on the PIC meant to be used to drive another device that requires a clock?

By the way, here is how you would code it using the #byte method:

void main(void)
{
...

while (1)
{
if (PORT_B & 0x01) // Is P ...

I have gotten used to not using CCS's functions for reading port pins' status.

#byte port_b=0xf81 // on a picf18f458, 0xF81 is the address of PORT B

...

unsigned char x;

x = port_b; // ...

I would suggest getting a demo board such as the PICDEM-2 from Microchip, and then write simple programs to toggle the LED(s), use I2C to read a temperature sensor, use PWM to sound a piezoelectric bu ...

Regarding the compiler:
I was told that i would have to buy a new version of PCHL altogether, despite the fact that i have a pch and pcwh subscription already.

Regarding drivers and programming:
...

In my application, i have a brushed DC motor that is controlled with an H-bridge. I accomplish braking by PWM'ing at least ONE bottom fet. You can PWM two bottom fets, but since most fets have interna ...

Make life simple and look at the schematic of the NUF2070MN at onsemi.com

Notice there is an LC filter in between the two TVS diodes. I have a similiar circuit in my application, but it is made up ...

On one of Circuit Cellar magazine's ads, i found www.protocase.com

You can download their super easy CAD tool, and with it draw any shape of cutout you want and spend $100+ for a few prototypes.
...

Sorry, the input signal is a 5v pulse and it occurs when somebody cut the beam of each sensor. I'll have 12 sensors and its could interrupt each 10ms aprox. I need to detect each interrupt of each sen ...

Well why don't you just use the 4520 then? They are similiar enough, and Microchip wants you to use the 4520 for new designs instead of the 452

I don't think the '452 has an internal oscillator.

I sort of see now. So for the first suggested workaround:

Work around
Do not write to TMR1H/TMR3H while Timer1/
Timer3 is running,...

If I follow this workaround, then I simply need t ...