Mystery instability of 16f628a

[mackrackit]

I am programming in circuit with PicKit 2 which has suddenly decided to stop the circuit working if I disconnect it.

Sounds like a MCLR issue. Try _MCLRE_OFF
in your configs.

[Pimentel]

Put a 100nF capacitor near pins 5 and 14 (gnd and vcc) !
Its solve my mistery problems in the pass.

Good luck
Pimentel

[hardcore]

I had problem with 16f628a
After repeating to reprogram IC with the same code it start working as has to be.
Possible disadvantage of 16f628a is some bits of reprogrammed memory do not change their state during programming.
Hope it helps.
hardcore

[George]

Hi David,

I had exactly the same problem as you seem to be having with a project I'm currently working on, also with a PIC16F628a.

I found the answer to be _LVP_OFF

What would happen is it defaults to LVP on, each time it would get a signal on the LVP pin, the micro would reset, hope this helps