PIC lights on, Assembly Language

Assignment Help:
errorlevel -302 ;prevents error code for this chipset
__config 0x373A ;chip config PIC spec page 146
processor 16F877A ;chipset

reset code 0x00
pagesel start ;Chooses pages from goto
nop ;does nothing
goto start

;**************************************************************************
code ;LABEL
start ;Label
clrf STATUS ;clear status from regester(Z is in status regester)
clrf PORTA ;clear port A
clrf PORTB ;clear port B
movlw 0x03 ;move literal into w
movwf PORTA ;move w into f

bsf STATUS, RP0 ;bit set f status, Regestry bank 0
movlw 0x07 ;move literal into w
movwf ADCON1
clrf TRISA ;clear register TriState regestry port A
clrf TRISB ;clear register TriState regestry port B
clrf TRISD ;clear register TriState regestry port D

CLRF STATUS
;*******************************************************************************
loop ;Start a Loop function
call LCD_update ;Calls LCD_Update function
call delay ;Calls delay function for time
goto loop ;Returns to loop


LCD_update_code code ;LAbEL
LCD_update ;LABEL

;IF CONTROL
sw1 btfsc PORTB, 1
goto display1
btfsc PORTB, 0
goto display2
display1
bcf PORTB, 0x01 ;turn Off LED 2
movlw 0xF9 ;Set number 1
movwf PORTD ;move w to f set PORTD
bsf PORTB, 0x00 ;turn On LED 1
goto finish_display

sw2 btfsc PORTB, 0
goto display2
btfsc PORTB, 1
goto display3
display2
bcf PORTB, 0x00 ;turn off LED
movlw 0x24 ;Set number 2
movwf PORTD
bsf PORTB, 0x01 ;turn on LED 2
goto finish_display


sw3 btfsc PORTB, 1
goto display3
btfsc PORTB, 0
goto display4
display3
bcf PORTB, 0x04 ;turn off LED 4
movlw 0x30 ;Set number 3
movwf PORTD
bsf PORTB, 0x02 ;turn on LED 3
goto finish_display


sw4 btfsc PORTB, 0
goto display3
btfsc PORTB, 1
goto finish_display
display4
bcf PORTB, 0x02 ;turn off LED 3
movlw 0x8D ;Set number 4
movwf PORTD
bsf PORTB, 0x04 ;turn on LED 4
goto finish_display

finish_display
RETURN

;*****************************************************************
;Variables for delay function

delay_udata udata ;LABEL
x res 2 ;x reserves 2 bytes

.delay code
delay
banksel x
clrf x
movlw 20
movwf x + 1
decfsz x, 1
goto $-1
decfsz x + 1, 1
goto $-3
return

end

Related Discussions:- PIC lights on

Xor-logical instruction-microprocessor, XOR: Logical Exclusive OR: The XOR...

XOR: Logical Exclusive OR: The XOR operation is again carried out in a similar way to the AND and OR operation. The constraint over operands are also similar. The XOR operation pr

Flowchart for the sequence of 8251-microprocessor, Flowchart for the sequen...

Flowchart for the sequence of 8251 Whether the control, mode or sync character register is selected depends on the accessing sequence.  A flowchart of the sequencing is given i

8086 microprocessors, program to find negative and positive integers from g...

program to find negative and positive integers from given signed numbers with output and explanation of every instructions.

Interrupt system based on 8259 a-microprocessor, Interrupt System Based on ...

Interrupt System Based on Single 8259 A The 8259A is contained in a 28-pin dual-in-line package that need only a + 5-V supply voltage.  Its organization is shown in given figur

L.A, How is bob different from johnny in the outsiders

How is bob different from johnny in the outsiders

Can you write this Program for me please? , $NOMOD51 $NOSYMBOLS ;**********...

$NOMOD51 $NOSYMBOLS ;***************************************************************************** ; Spring 2013 Project ; ; FILE NAME : Project.ASM ; DATE : 3/30/20

Instructions, Difference between div and idiv

Difference between div and idiv

Program for dispaying lcd characters, #include"lcd.asm"       ; assembly fi...

#include"lcd.asm"       ; assembly file is included for displaying lcd characters Main: PORTA EQU 0xF80  ; PORTS PORTB EQU 0xF81 PORTC EQU 0xF82 PORTD EQU 0xF83 R

Software interrupts-microprocessor, Software Interrupts Software interr...

Software Interrupts Software interrupts are the result of an INT instruction in an executed program.  It may be assumed as a programmer triggered event that immediately stops e

Intel''s 8237 dma controller-microprocessor, Intel's 8237 DMA controller : ...

Intel's 8237 DMA controller : 1) The 8237 contain 4 independent I/O channels 2) It contains 27 registers, 7 of which are system-wide registers and 5 for each channel. 3)

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd