First program in assembly for pic16f628

My program just turns on a led with pic16f628. This is quite simple for all beginner programers, because you just need to write this :


I have compiled with MPLAB (a free compiler from Microchip) , and programed my pic with icprog.


ORG function - Programs starts at 0x000 in pic's memory


bsf - bit set f

bsf f,b

bit "b" in register f is set.


movlw -move literal to 'w'
movlw k
bit literal "k" is loaded into the 'W' register.

movwf function -move data from "W" reg to "F" register.

bcf -Bit clear f
bcf f,b
bit 'b' from 'f' register is cleared.


Why did I change my place from Bank0 to Bank1 and viceversa? (I am talking about bsf STATUS,RP0 and bcf STATUS,RP0 line code)

Answer: Because TRISA register is located in Bank1 for this microcontroller and PORTA register is located in Bank0 . So , I wrote to reg TRISA , status '0' for output pins :
bit 0 -for output pins : LEDS, LOADSPEAKERS, etc
bit 1 -for input pins: Buttons ,etc

and 1 (movlw 0xff , movwf PORTA) at PORTA to turn on the leds from A pins .

Take a look at Bank0 and Bank1 locations: