PIC16F876A - Banks - Assembly

I'm confused on a question i have in my homework assignment, it states;

Code:

What does PIC16F976A "BANKS" mean? Why does it need "banks"? How does it select banks?

I know how to change banks in assembly, but i'm a little confused on the exact definition of a bank. For what i can think of is that a bank is sort of like a location on the processor, where it loads different commands. Sort of like grouping them into different area's.

I have no idea how to answer it. Please help me here. I'm a microprocessor noob.



Also, how can i make it reset after every time i press the reset button? I have the loops to "Pause it"(EDIT WELL I DID BUT I WAS PLAYING WITH IT) But how to i make it so it resets every time i press a button at any time? Is there an easier way of doing it instead of putting a GOTO loop after every LED flash?

Code:

	list		p=16f876A		; list directive to define processor
	#include	<p16f876A.inc>		; processor specific variable definitions
	
	__CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_OFF & _HS_OSC & _WRT_OFF & _LVP_OFF & _CPD_OFF

; '__CONFIG' directive is used to embed configuration data within .asm file.
; The labels following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.






;***** VARIABLE DEFINITIONS

w_temp		EQU	0x71		; variable used for context saving 
status_temp	EQU	0x72		; variable used for context saving
pclath_temp	EQU	0x73		; variable used for context saving		


	ORG	0x20
DVAR0		EQU 	0x20		; Variable used in delay loop (inner counter #)
DVAR1		EQU	0x21		; variable used in delay loop (middle counter #)
DVAR2		EQU 	0x22		; variable used in delay loop (outer counter #)
	


;**********************************************************************
	ORG     0x000          	; processor reset vector

	nop			; nop required for icd
  	goto    main           	; go to beginning of program


	ORG     0x004          	; interrupt vector location

	movwf   	w_temp         		; save off current W register contents
	movf		STATUS,w        	; move status register into W register
	movwf		status_temp     	; save off contents of STATUS register
	movf		PCLATH,w	  	; move pclath register into w register
	movwf		pclath_temp	  	; save off contents of PCLATH register

; isr code can go here or be located as a call subroutine elsewhere

	movf		pclath_temp,w	  	; retrieve copy of PCLATH register
	movwf		PCLATH		  		; restore pre-isr PCLATH register contents
	movf    	status_temp,w     	; retrieve copy of STATUS register
	movwf		STATUS            	; restore pre-isr STATUS register contents
	swapf   	w_temp,f
	swapf   	w_temp,w          	; restore pre-isr W register contents
	retfie                    		; return from interrupt



main

; remaining code goes here


Init

	bsf		STATUS, RP0  		; select Bank1. (RP0 and RP1 are "0" by default)

	movlw		0x47			; W.REG = 01000111B
	movwf		ADCON1			; set up all pins of PORTA as digital pins 

	movlw		0x0F			; W.REG = 00001111B
	movwf		TRISA			; set up input pins (RA3-RA0) and output pins (RA5-RA4) of PORTA.
		
	movlw		0x40			; W.REG = 01000000B
	movwf		TRISB			; set up PORTB. Input pins: RC6; Output pins: RB7, RB5-RB0 

	movlw		0xA3			; W.REG = 10100011B
	movwf		TRISC			; set up PORTC. Input pins: RC7, 5, 1, 0; Output pins: RC6, RC4-RC2


	bcf		STATUS, RP0  		; select Bank0.


Loop

	btfss		PORTC, RC5		; check RC5 (the button). If it is "1", skip the next line (instruction)
	goto		Loop			; If RC5=0, halt there and continue to check RC5 bit until it is"'1", i.e. the button is released

	
	call 		Hello			; call "Hello" subroutine, which turns L-LED on & R-LED off for 0.5 seconds
						; and then turns L-LED off & R-LED on for 0.5 seconds.
	call		Howareyou

	call		Imverywellthanks

	call		hahahahahah

	goto		Loop			; Check RC5 bit (the switch) if it is pressed down.




Hello
	Loop1
	btfss		PORTC, RC5
	goto		Loop

	bcf		PORTA, RA4		; RA4=0 to turn on  L-LED  (active LOW)
 	bsf		PORTA, RA5		; RA5=1 to turn off R-LED  (active LOW)

	call	Delay			; Delay 0.5 seconds

	bsf		PORTA, RA4		; RA4=1 to turn off L-LED (active LOW)
 	bcf		PORTA, RA5		; RA5=0 to turn on  R-LED (active LOW)

	call	Delay			; Delay 0.5 seconds
	

	return

Howareyou
	Loop2
	btfss		PORTC, RC5
	goto		Loop

	bcf	 	PORTA, RA4			; RA4=0 to turn on  L-LED  (active LOW)
	bsf		PORTA, RA5			; turn led right off

	call	Delay				;delay for 0.5
	
	bsf		PORTA, RA4			; ra4 = 0 turn on left led

	call	Delay				;delay for 0.5

	bcf		PORTA, RA4			; ra4 = 0 turn on left led

	call	Delay				;delay for 0.5
	
	bsf		PORTA, RA4			; ra4 = 0 turn on left led

	call	Delay				;delay for 0.5

	bcf		PORTA, RA4			; ra4 = 0 turn on left led
	
	call	Delay				;delay for 0.5

	bsf		PORTA, RA4
	
	call	Delay				; delay for 0.5secs



	return

Imverywellthanks
	Loop3
	btfss		PORTC, RC5
	goto		Loop

	bcf		PORTA, RA5			;right led on
	bsf		PORTA, RA4			;left led off

	call	Delay
	
	bsf		PORTA, RA5			;right led off


	call	Delay

	bcf		PORTA, RA5			;right led on


	call	Delay
	
	bsf		PORTA, RA5			;right led off


	call	Delay

	bcf		PORTA, RA5			;right led on
	
	call	Delay
	
	bsf		PORTA, RA5			;right led off


	call	Delay

	bcf		PORTA, RA5			;right led on

	call	Delay
	
	bsf		PORTA, RA5			;right led off

	call	Delay


	return

hahahahahah
	Loop4
	btfss		PORTC, RC5
	goto		Loop

	bcf		PORTA, RA5			;turn right led on
	bcf		PORTA, RA4			;turn left led on

	call	Delay

	bsf		PORTA, RA5			;turn right led off
	bsf		PORTA, RA4			;turn left led off

	call	Delay

	bcf		PORTA, RA5			;turn right led on
	bcf		PORTA, RA4			;turn left led on

	call	Delay

	bsf		PORTA, RA5			;turn right led off
	bsf		PORTA, RA4			;turn left led off

	call	Delay

	bcf		PORTA, RA5			;turn right led on
	bcf		PORTA, RA4			;turn left led on

	call	Delay

	bsf		PORTA, RA5			;turn right led off
	bsf		PORTA, RA4			;turn left led off

	call	Delay

	

	return

Delay
	movlw		0x14			; set outer delay loop to 500 ms (20*25 ms, 0X14=20d)
	movwf		DVAR2			; move 0x10 into VAR2 variable

Delay0
	movlw		0xFA			; set middle delay loop to 25 ms (250*100 us, 0XFA=250d)
	movwf		DVAR1			; move 0xFF into VAR1 variable

Delay1
	movlw		0xA5			; set inner delay loop to 100 us (use stop watch tested, 0XA5=165)
	movwf		DVAR0			; move 0xFF into VAR0 variable

Delay2
	decfsz		DVAR0			; DAVR0=DAVR0&#8211;1 and skip next instruction if DAVR0=0
	goto		Delay2			; loop to Delay2
	
	decfsz		DVAR1			; DAVR1=DAVR1&#8211;1 and skip next instruction if DAVR1=0
	goto		Delay1			; loop to Delay1

	decfsz		DVAR2			; DAVR2=DAVR2&#8211;1 and skip next instruction if DAVR2=0
	goto		Delay0			; loop to Delay0

	return					; return to where &#8220;call delay&#8221; happened&#8221;


	END                       		; directive 'end of program'