Program to find factorial using 8051 :
MOV R1,#04 MOV R0,#04 MOV A,R0CALL:DEC R0MOV F0,R0MUL ABDJNZ R1,CALL SJMP...
Wednesday, 20 March 2013
Tuesday, 19 March 2013
Program to generate 50msec delay
26. Program to generate 50msec delay:
mov tmod,#01 ;select timer 0
here:mov tl0,#0fdh ;load tl0 with 0fdh
mov th0,#4bh ;load th0 with 4bh
cpl p1.5 ;compliment p1.5
acall delay ;call delay routine
sjmp here ;jump to here
delay:mov r1,#0c8h ;load r1 with data 0c8h
l1:setb tr0 ;set bit tr0
again:jnb tf0,again ;repeat till tf0=0
clr tr0 ;clear tr0
clr...
Program to implement BCD counter to count from 99-0
25;Program to implement BCD counter to count from 99-0 :
here:mov b,#99h ;move 99h to b
up:mov a,b ;move data from b to a
add a,#99h ;add 99h to a
da a ;decimal adjust accumulator after addition
mov b,a ;move data from b to a
mov p0,a ;move data from a to p0
acall delay ;call delay routine
mov a,b ;move data from b to a
cjne a,#0ffh,up ;compare...
Program to implement BCD counter to count from 0-99
24. Program to implement BCD counter to count from 0-99 :
here:mov a,#0h ;move 0 to a
up:mov p0,a ;move data fr
acall delay ;call delay program
inc a ;increment a
da a ;decimal adjust accumulator after addition
cjne a,#100,up ;compare a with 100, if not equal, jump to location up
sjmp here ;jump to location here
delay routine
delay:mov r1,#0ffh...
Program to count from 0-9
23. Program to count from 0-9 :
here:mov a,#0h ;move 0 to a
up:mov p0,a ;move data from a to port0
acall delay ;call delay routine
add a,#01 ;increment a
cjne a,#010,up ;compare a with 10, if not equal, jump to location up
sjmp here ;jump to location here
;delay routine
delay:mov r1,#0ffh ;move 0ffh to r1
l3:mov r2,#0ffh ;move 0ffh to r2
l2:mov...
Program to find the square of an 8 bit number
22.Program to find the square of an 8 bit number :
mov dptr,#9000h ;load dptr with 9000h
movx a,@dptr ;move data from external memory location to a
mov b,a ;move data from a to b
mul ab ;multiply and b
inc dptr ;increment dptr
mov r0,a ;move data from a to r0
mov a,b ;move data from b to a
movx @dptr,a ;move data from a to external memory location
inc...
Program to add two BCD numbers
21. Program to add two BCD numbers :
mov dptr,#9000h ;move dptr with 9000h
movx a,@dptr ; move data from external memory location to a
mov b,a ;move data from a to b
inc dptr ;increment dptr
movx a,@dptr ; move data from external memory location to a
add a,b ;add a and b
da a ;decimal adjust accumulator after addition
jc down ;if carry, jump to...
Program to check whether a 4th bit of a byte is 1, Store FFh if 1, else store 00 in
20. Program to check whether a 4th bit of a byte is 1, Store FFh if 1, else store 00 in :
the same location
mov dptr,#9000h
movx a,@dptr ;move data from external memory location to a
jnb 0e3h,down ;jump to location down, if 4th bit of a is set
inc dptr ;increment dptr
mov a,#0ffh ;move 0ffh to a
movx @dptr,a ;move data from a to external memory...
Program to convert ASCII to hex
19. Program to convert ASCII to hex :
ASCII codes 30 to 39 represent 0 to 9 in binary and 41 to 46 represent A to F. Therefore
if the ASCII code is between 30-39h then 30h is subtracted from the code. If the number
lies between A to F then 37h is subtracted from the code to get its binary equivalent
mov dptr, #9000h ;load dptr with address 9000h
movx...
Program to find largest of n numbers
18. Program to find largest of n numbers :
mov r0,#10h ;move immediate data 10h to r0.
mov a,@r0 ;move data from internal RAM location to a
mov r2,a ;move data from a to r2
dec r2 ;decrement r2
inc r0 ;increment r0
mov a,@r0 ;move data from internal RAM location to a
l2:push 0e0h ;save the content of a on stack
inc r0 ;increment r0
subb a,@r0 ;subtract...
Program to count number of 1's in a given data byte
17. Program to count number of 1's in a given data byte :
mov dptr,#9000h ;Load dptr with 9000h
movx a,@dptr ;move data from external memory location to a
mov r0,#0h ;load r0 with 0
mov r1,#8h ;load r1 with 8
clr c ;clear carry bit
up:rlc a ;rotate a left through carry
jnc next ;if no carry, jump to label next
inc r0 ;increment r0
next:djnz r1,up...
Program to divide an 8 bit no by another 8 bit number
16. Program to divide an 8 bit no by another 8 bit number :
mov r0,#26h ;load r0 with immediate data 26h
mov a,@r0 ;load a with data from internal RAM location(dividend)
inc r0 ;increment r0
mov b,@r0 ;move data from internal RAM location to b(divisor)
div ab ;divide a by b
inc r0 ;increment r0
mov @r0,a ;load internal RAM location with data from...
Program to sort an array of 10 elements
15. Program to sort an array of 10 elements :
mov r3,#0ah ;load r3 with immediate data 0ah
dec r3 ;decrement r3
start:mov a,r3 ;move data from r3 to a
mov r0,a ;move data from a to r0
mov dptr,#9000h ;Load dptr with address 9000h
l1:movx a,@dptr ;move data from external memory location to a
mov r1,a ;move data from a to r1
inc dptr ;increment dptr
movx...
Program to search an element in an array
14. Program to search an element in an array :
mov r0,#05h ;Load r0 with immediate data 05h
clr a ;clear a
mov dptr,#9000h ;load dptr with address 9000h
mov r1,#0ah ;load r1 with immediate data 0ah
l1:mov a,#0h ;load a with 00
movc a,@a+dptr ;move data from code memory location to a
mov r2,a ;move data from a to r2
inc dptr ;increment dptr
dec r1...
Program to multiply 16 bit number by 8 bit number
13. Program to multiply 16 bit number by 8 bit number :
mov r0,#11h ;load r0 with immediate data 11h
mov r1,#22h ;load r1 with immediate data 22h
mov r2,#33h ;load r2 with immediate data 33h
clr c ;clear carry bit
mov a,r0 ;move data from r0 to a
mov b,r2 ;move data from r2 to b
mul ab ;multiply and b
mov dptr,#9000h ;Load dptr with 9000h
movx @dptr,a...
Program to find the LCM of two numbers
12. Program to find the LCM of two numbers :
mov dptr,#9000h ;Load dptr with immediate data 9000hmovx a,@dptr ;move data from external memory location to a
mov r0,a ;move data from a to r0mov b,r0 ;move data from r0 to binc dptr ;increment dptrmovx a,@dptr ; move data from external memory location to amov r2,a ;move data from a to r2l2:push...
Program to interchange two blocks of data
11. Program to interchange two blocks of data :
mov dptr,#9000h ;Load 9000h into dptr register
mov r0,#04h ;Move immediate data 04 to r0
mov r1,#90h ;move immediate data 90h to r1
mov r2,#91h ;move immediate data 91h to r2
back:movx a,@dptr ;move data from external memory location to a
mov r3,a ;move data from a to r3
mov dph,r2 ;move data from...
Program to convert an 8bit Hex number to decimal number
10. Program to convert an 8bit Hex number to decimal number :
mov dptr,#9000h ;Load 9000h into dptr register
movx a,@dptr ;move data from external memory location to a
mov r2,a ;move data from a to r2
clr c ;clear carry bit
subb a,#0ah ;subtract with borrow, 0ah from a
jc over ;if carry, jump to label over
mov a,r2 ;move data from r2 to a
subb a,#064h...
Program to convert hex number to ASCII number
9.Program to convert hex number to ASCII number :
mov dptr,#9000h ; Load dptr with immediate data 9005h
movx a,@dptr ; Load dptr with immediate data 9005h
clr c ;clear carry bit
subb a,#0ah ;subtract with borrow, 0ah from
movx a,@dptr ; move data from external memory location to a
jc down ;if carry, jump to label down
add a,#07h ;add 07 to a
down:add...
Program to find the GCF of two numbers
8.Program to find the GCF of two numbers :
mov dptr,#9000h ;Load 9000h into dptr register
movx a,@dptr ; move data from external memory location to a
mov b,a ; move data from a to b
inc dptr ;increment dptr
movx a,@dptr ; move data from external memory location to a
back:mov r1,b ;move data from b to r1
div ab ;divide a by b
mov a,b ;move data from...
Program to generate Fibonacci series
7. Program to generate Fibonacci series :
mov r1,#0ah ;Load r1 with immediate data 0ah
mov dptr,#9000h ;load 9000h into dptr register
movx a,@dptr ; move data from external memory location to a
inc dptr ;increment dptr
mov r0,a ;move data from a to r0
movx a,@dptr ; move data from external memory location to a
back:mov r2,a ;move data from a to...
6. Program to convert a decimal number to hex number :
mov dptr,#9000h ; Load 9000h into dptr register
movx a,@dptr ; move data from external memory location to a
mov r2,a ;move data from r2 to a
clr c ;clear carry bit
subb a,#0ah ;subtract with borrow, 0ah from a
jc over ;if carry, jump to label over
mov a,r2 ;move data from r2 to a
anl a,#0f0h...
To transfer a block of data from one memory location to another
5. To transfer a block of data from one memory location to another :
mov r2,#0ah ;Load r2 with immediate data 05h
mov dptr,#9000h ;Load 9000h into dptr register
mov r0,#0a0h ;Load r0 with immediate data 0a0h
mov r1,#00h ;Load r1 with immediate data 00h
mov a,#0h ; Load a with immediate data 00h
up:movx a,@dptr ;move data from external memory to...
Program to find the average of 10 numbers
4: Program to find the average of 10 numbers:
mov dptr,#9000h ;Load 9000h into dptr register
clr a ;Clear a register
mov 0f0h,a ;move data from a to b
mov r1,#05h ;move 05 to r1 register
up: movx a,@dptr ; ;move data from external memory location to a
add a,0f0h ;add a and b
mov 0f0h,a ;move the result to b
dec r1 ;decrement r1
inc dptr ;increment...
3: ASCII to BCD conversion:
To convert ASCII to packed BCD, it is first converted to unpacked BCD(to mask 3) and
then combined to make packed BCD. For example, for 4 and 5 the keyboard gives 34 and
35, respectively. The goal is to produce 45h, which is packed BCD.
;ASCII to packed BCD conversion
mov r0,#10h ;R0=10h,Internal memory adress
mov a,@r0...
Program to convert a BCD number to ASCII
2. Program to convert a BCD number to ASCII using 8051 :
To convert packed BCD to ASCII, it must first be converted to to unpacked BCD. Then the unpacked BCD is tagged with 30h.
mov dptr,#9000h ;Load 9000h into dptr register
movx a,@dptr ;Move the content of location 9000h to a
mov r2,a ;Move the data from a to r2
anl a,#0f0h ;And a with 0f0h
swap...
Program to add two multibyte numbers
8051 MICROCONTROLLER
Programs:
1.Program to add two multibyte numbers using 8051 .
mov r4,#0h ;move 00 to r4
mov r3,#0h ;move 00 to r3
mov dptr,#9000h ; Load 9000h into dptr register
movx a,@dptr ;move the data from memory location to a register
mov r0,a ;move the data from a to r0
inc dptr ;increment dptr
movx a,@dptr ;move the data from...
Sunday, 17 March 2013
HOW TO PROGRAM 8051 ????
TOOLS FOR PROGRAMMING -
>A51-ASSEMBLER
>CODE EDITOR-syntax highlighting notepad
>SIMULATOR-small and smart
>BAUD-timer value caluculation
>C COMPILER FOR 8051
>RIDE-software simulation CLICK
>KEIL UVISION 4- 8051/ARM simulation CLICK (MOST PREFERRED )
>PROTEUS-fully embedded...
Tuesday, 12 March 2013
Free online technical books !
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Monday, 11 March 2013
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