Processor 16F628A
#inclde "p16f628a" <<< spelling #include
_config _CP_OFF & _WDT_OFF & _PWRTE_ON & _INT_OSC
;List p=16f628a
;include "P16F28A"
;-config 0x3D18
org 0x0000
movlw 0x07
movwf CMCON
bsf STATUS, RPO <<<RP0, but they appear to look the same to you
movlw b'00000000 <<< missing ' at end
movwf TRISB
movwf TRISA
bcf STATUS <<< Which bit you want to clear???
loop
movlf 0xff <<< no such instruction
movwf PORTA
movwf PORTB
nop
nop
movlw 0x000
movwf PORTA
movwf PORTB
goto loop
end