ASSEMBLY CODE FOR WIRELESS TRANSMISSION USING RF

this can be changed. it ran at 12MHz not at 433MHz but I think it will be ok.

        mov     dpx, a
        mov     dph, #0
        mov     dpl, #0
        movx    a, @dptr          ; get the first byte on this page
        mov     b, a              ; store it in b
        push    ie
        clr     ea                ; disable interrupts while we write
        clr     a                 ; try to write a 0
        movx    @dptr, a
        nop
        nop
        movx    a, @dptr          ; did it stick?
        jnz     f_eb_isflash
        mov     a, #0FFh          ; now try to write FF
        movx    @dptr, a
        nop
        nop
        movx    a, @dptr          ; did it stick?
        cpl     a
        jz      f_eb_restore      ; if zero, it wrote and must be RAM
        ;
        ; if it didn't stick, it is probably flash.  try to erase.
        ;
f_eb_isflash:
        mov     a, r7
        ROMCALL ROMXT_FLASHSECTORERASE
        pop     ie                ; restore interrupts
        mov     r7, #0
        jc      f_eb_exit
f_eb_fail:
        mov     r7, #1          ; flag failure if carry bit clear

If your project just requires presenting the work of others, then there are plenty of 433MHz radio modules that connect with a simple CMOS serial interface.

www.hoperf.com/.../HM-TRP.htm

uav.tridgell.net/.../telemetry.pdf
https://github.com/tridge/SiK