Old analog guy needs help with PIC16F57

[yankee]

So I'm venturing away from the PIC16F168A and it's internal oscillator for the first time ever. I need to drive an old BIT display with +5v and -5v. I bought the PIC16F57 because it has enough I/Os to do the job. So I go into the data sheet and after reading it over and over (8 hours worth!), I'm thoroughly confused about the resonator setup. I bought some Murata CSTLS20M0X53-B0 20 MHZ resonators, but now I'm not sure if I can use them. If I can use them, how is the resonator connected to the IC correctly?

Now for the code ... if I could get an example of a simple code to toggle a port from low to high a few times a second, I can figure out the rest. Any help at all is greatly appreciated!

~ Dave

[yankee]

I tried programming the following code onto two different brand new ICs.

loop:

high portb.4    ' turn the LED on
pause 500       ' wait 500ms
low portb.4     ' turn the LED off
pause 500       ' wait 500ms
goto loop       ' repeat

I'm getting a popup that says "Device not blank. Program anyway?" and when I click yes, I get the error "Code programming error at 0000."

The program is compiled for the PIC16F57 and I made sure that I selected the correct IC in the programmer. I'm bummed.

[mister_e]

Looks like a device programmer issue. Usually this error is caused by a too low VPP voltage on MCLR, and/or poor power supply filtering.

Which programmer are you using? If it's a JDM based + you're using a USB to Serial adapter, then yes, you run into usual problems.

You can try to erase the device, then reprogram it...

[Acetronics2]

Hi,

I think I already have seen something like that on the Forum ...

So ...

1) Which is the programmer ???

2) Is it "up to date" for soft version ???

Alain

[yankee]

OK, I think I've found the problem. The voltage pins are in odd places on this IC, so I may have to do in-circuit programming; something else that I've never done. I'm going to figure out how to do that next and I'll get back with any results.

Here's the code that I'll be using for a test:

@ device  pic16F57, hs_osc, wdt_off, protect_off

main:       

high portA.0
pause 500
low portA.0
pause 500
goto main

I'm using the old serial programmer and my first problem was not having the cable plugged into the correct header and the IC pin 1 was in the wrong place. Even now with the cable plugged into the correct header and the IC in the ZIF socket correctly, I'm getting a code programming error at 0000.

[Bruce]

The 16F57 is laid out really funky with Vdd on pin #2, Vss on pin #4, Vpp, pgmdata, pgmclock, etc all in odd places, so there's probably not any ZIF adapter compatible with this one.

Wire it for in-circuit like shown here: http://melabs.com/support/icsp.htm

[yankee]

Thanks again Bruce!

[Acetronics2]

The 16F57 is laid out really funky with Vdd on pin #2, Vss on pin #4, Vpp, pgmdata, pgmclock, etc all in odd places, so there's probably not any ZIF adapter compatible with this one.

Wire it for in-circuit like shown here: http://melabs.com/support/icsp.htm

Hi Bruce ...

Microchip AC 162049 Universal adapter CAN do it ...

Alain