16f88 problems

[aratti]

'declare inputs and outputs appropriately
PortA = 0
PortB = 0
TRISA = %00111100 ' a.5 is INPUT only
TRISB = %11100100

Try to set portA and B to zero before Tris
What value is your pulldown resistor?

Al.

[mikey11]

'declare inputs and outputs appropriately
PortA = 0
PortB = 0
TRISA = %00111100 ' a.5 is INPUT only
TRISB = %11100100

Try to set portA and B to zero before Tris
What value is your pulldown resistor?

Al.

the pulldown resistor is 1000 ohms.

I won't have the opportunity to try new code for a while, but I will try that when I get a chance.

[Archangel]

the pulldown resistor is 1000 ohms.

I won't have the opportunity to try new code for a while, but I will try that when I get a chance.

I agree with Al, set port latches low before the tris register and make sure RBPU is disabled OPTION_REG.7 = 1

[languer]

The following may correct any R-W-M mismatch condition, but it is a little risky to write to the output latch (even if not an output) when it maybe directly connected to +5V (through the SW):

PortA = 0
PortB = 0

Would an initial read to the port, before the actual loop, do the same?

The RBPU should be disabled by default (unless PBP assigns it behind the scenes).

For these reasons I would have the port connected to +5V through a 10k resistor; and the switch would connect the port to GND (may be through 1k for protection).

The following post may give some ideas (not identical, but helps illustrate): http://www.picbasic.co.uk/forum/show...t=weak+pull-up

[languer]

Forgot to say that should you do this:

For these reasons I would have the port connected to +5V through a 10k resistor; and the switch would connect the port to GND (may be through 1k for protection).

You would change your code to read, "if startbutton = 0".