i'm workin on a wireless security sys project based on microcontrollers 89c51 & 89c2051.with d help of this h/w the system admin jus has 2 keep the receiver module in his hand & al the other intruder details wil be displayed on the lcd screen alongwith buzzer sys activation.
i need an assembly language program to interface 89c2051 with smoke detector sensor & intruder alarm sensor.
so please help me....

 

You need to do the work. Post up the circuit and how you think the program should function, and we can give help, but we won't do the design or write the code for you.

 

Hey,

Can U Plz Tell Me The Use Of "$" And "#" Symbol While Programing In 89c2051.

And Can U Let Me Know The Use Of Instructions "ds" And "org"

While Reffering A Program, I M Getting Stuck At Following Instruction :

Org $3000

 

I only know the $ in 8051 assemblers as the "itself" argument. For example, "JNE $" means jump to itself if accumulator does not equal 0.

I think the "#" means a prefix to a number indicating the number is an absolute value.
I use DS in 808x/x86 programming because DS is a data segment for those processors.

ORG x means start writing code at location x. so in your case, I think that location 3000 decimal is where your code will begin in memory.

If you want to use hexadecimal numbers, then add an "h" to your number to make the number hex. Also it is a good idea to prefix the number with a zero.

 

HI.. THANKS 4 HELPING ME OUT WIT THE INSRUCTION.
CAN U BRIEF ME A BIT ABOUT THIS PROGRAM(PLEASE)....


*#cpu 8051 Tiny
*
* DDS MICRO-C 8031/51 Startup Code & Runtime library for TINY model
*
* Copyright 1991-1999 Dave Dunfield
* All rights reserved.
*
ORG $0000 $0800 CODE Starts here (Normally in ROM)
LJMP START

ORG $0003
LJMP SERVICE_EX0

ORG $000B
LJMP SERVICE_TIMER0_INTERRUPT


* Fixed memory locations for alternate access to the R0-R7 register bank.
* If you are NOT useing BANK 0, these equates must be adjusted.
?R0 EQU 0 Used for "POP" from stack
?R1 EQU ?R0+1 Used to load index indirectly
?R2 EQU ?R0+2 "" "" "" ""
?R3 EQU ?R0+3 Used by some runtime lib functions
?R4 EQU ?R0+4
?R5 EQU ?R0+5
?R6 EQU ?R0+6
?R7 EQU ?R0+7
*
* Startup code entry point
*
* If you are NOT using interrupts, you can reclaim 50 bytes
* of code space by removing the following TWO lines.
* AJMP *+$0032 Skip interrupt vectors
* DS $0032-2 Reserve space for interrupt vectors
*
START EQU *
MOV SP,#?stk-1 Set up initial stack
ORL TMOD,#%00000001 set timer 0 to be counter 16 bit
SETB IE.7 $AF EA
SETB IE.1 $A9 ET0 Enable timer 0 interrupt
SETB TCON.4 start timer 0


LCALL main Execute program
SJMP * JUMP HERE

* EXIT to MON51 by calling the 'timer1' interrupt vector ($001B).
* This causes MON51 to think that a single-step operation has just
* completed, and therefore it saves the user registers, and performs
* a context switch back to the monitor.
*
* When using 2K addressing (CC51: -Z option, ASM51: -A option) this LCALL
* may fail "Out of range" because it gets translated to ACALL, and $001B
* may not be in the same 2K block as your program. Since 2K devices cannot
* support a debugger, change the ORG to $0000, and ...<continue below>...
*
* If you are NOT using MON51 (or MONICA which works the same), you will
* need to change this to whatever action you desire when main() returns.
* Suggestions: 1:freeze (SJMP *) 2:Restart (SJMP *&$FF00)
exit LCALL $001B Call Timer-1 interrupt
SJMP exit Incase he go's again

**************************** My code *********************************

SERVICE_TIMER0_INTERRUPT EQU *
PUSH ACC
PUSH PSW
MOV TH0,#$FF reload timer 0 for ms
MOV TL0,#$00
INC tick

MOV A,tick
CJNE A,#100,RIGHT
MOV tick,#0

RIGHT
CLR C
SUBB A,speedright
JC ON_RIGHT
CLR P1.0
SJMP LEFT

ON_RIGHT
SETB P1.0

LEFT
MOV A,tick
CLR C
SUBB A,speedleft
JC ON_LEFT
CLR P1.1
SJMP EXIT_I

ON_LEFT
SETB P1.1

EXIT_I
POP PSW
POP ACC
RETI

SERVICE_EX0 EQU *
INC cputick
RETI


$SE:1
*#map1 Segment 1, initialized variables
$SE:2
*#map2 Segment 2, internal "register" variables
ORG $0008 Internal ram ALWAYS starts here

tick DS 1
speedright DS 1
speedleft DS 1
cputick DS 1

 

Its A Program About A Line Following Robot.. A Robo Wch Follows A Black Line On White Path.