Flash Led with PIC12F675 - schematics:

 


view  movie ( 136k ) with some flash modes

download code: pic12F675/FlashLed.asm

Some PIC Programmers can't rewrite the PIC12F675 microchip after first programming (the code use INTRC_OSC and MCLR_OFF) .
In this case try to use:

;----------------------------------------------------------------------
; Configurare
__CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _MCLRE_ON & _CP_OFF & _CPD_OFF

and a pullup resistor (1 .. 10k ohm ) to Vdd for -MCLR pin (GP3).

instead:

;----------------------------------------------------------------------
; Configurare
__CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_ON & _MCLRE_OFF & _CP_OFF & _CPD_OFF