how to interface ds1302 with at89s8252?

[tapan.entc]

ds1302 with at89s8252

how to interface ds1302 with at89s8252?
i have a problem on ram memory used in ds1302. There is no special registers for sec, min ,date as in other RTC.

So how i will write a code in assembly??

Please help me ...........

please give me assembly code for this.

please help me .......

 

[bassa]

Re: ds1302 with at89s8252

Hi tapan.entc,

I suggest that you can use forum's search facility to find solutions to your problems because this area might be discussed within the forum. Check some topic as below






regards
bassa

 

[tapan.entc]

Re: ds1302 with at89s8252

thanks bassa.

thanks for replying...
it will be better if you give suggestion on ds1302.

waiting for ur reply

 

[bassa]

Re: ds1302 with at89s8252

Hi,

herewith I upload "Interfacing a DS1302 With an 8051-Type Microcontroller" from MAXIM with C source code "DEMO1302.C" and you can modify the code to suit your requirements (**broken link removed**)

as well you check the following topics





and also go through the following links


**broken link removed**

hope this will help better

regards
bassa

 

[tapan.entc]

Re: ds1302 with at89s8252

hello bassa
thanks for replay and giving the links..... i will go for that links.
'but before that i have a request that please go through my asm code
and tell me where i am wrong .

i am interfacing ds 1302 with at89s52 and displaying the time in 2*16 lcd
please check the program and give me suggestion that where i am wrong.
the code is as :

;###############################################
;PROGRAM FOR INTERFACING RTC WITH AT89S8252
;author: Tapan Rout
;###############################################      
  	CE  EQU  P1.7        ; 
        IO  EQU  P3.4
        SCLK EQU  P1.6

	com_adr  equ 0fe00h	;LCD COMMAND REGISTER ADDRESS
	dat_adr  equ 0fe01h	;LCD DATA REGISTER ADDRESS

	ORG 0000H
	AJMP MAIN

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;MAIN PROGRAM STARTS HERE
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
	ORG 030H
MAIN:

	ACALL LCD_INIT		;initializing LCD

        MOV  R1,#8EH          ;  WRITE PROTECT  MODE
        MOV  R0,#0
        LCALL WRITE

	MOV  R1,#90H          ; TRICKLE CHARGER REGISTER AND DIODE SELECT
        MOV  R0,#0ABH		;2 DIODES, 8K
        ACALL WRITE

        MOV  R1,#80H          ; WRITE  SECONDS
        MOV  R0,#0
        ACALL WRITE

        MOV  R1,#82H          ; WRITE MINUTES
        MOV  R0,#05H
        ACALL WRITE

        MOV  R1,#84H           ;WRITE  HOURS 
        MOV  R0,#11H
        CALL WRITE		

        MOV  R1,#86H          ; WRITE DATE : 27 
        MOV  R0,#27H
        ACALL WRITE

        MOV  R1,#88H           ;WRITE  MONTH : 9(SEPTEMBER)
        MOV  R0,#9
        ACALL WRITE

        MOV  R1,#8CH          ; WRITE YEAR : 09 (2009)
        MOV  R0,#09H
        ACALL WRITE			
           
;/*
	mov scon,#50h
	mov tmod,#20h
	mov th1,#0fdh
	MOV TL1,0FDH
	mov tcon,#45h
	setb tr1   	;*/
SS:   
  	setb TI

 SS1:	MOV  R1,#81H         ; READ SECONDS
        CALL READ
        MOV  20H,R0

        MOV  R1,#83H         ; READ MINUTES
        CALL READ
        MOV  21H,R0
	
	MOV  R1,#85H         ; READ HOUR 
        CALL READ
        MOV  22H,R0
	
        MOV  R1,#87H         ; READ  DATE
        CALL READ
        MOV  23H,R0

        MOV  R1,#89H         ; READ MONTH 
        CALL READ
        MOV  24H,R0

        MOV  R1,#8DH         ; READ YEAR
        CALL READ
        MOV  25H,R0			

DIS:
	MOV A,21H		;read minutes and display in lcd
	PUSH ACC
	MOV A,#86H
	ACALL COMNWRT
	ACALL DELAY
	MOV A,#':'
	ACALL DATAWRT
	ACALL DELAY
	POP ACC
	ACALL ASCIICONV	

	MOV A,22H		;rad hours and display in lcd
	PUSH ACC
	MOV A,#84H
	ACALL COMNWRT
	ACALL DELAY
	POP ACC
	ACALL ASCIICONV

	MOV A,22H
	JB ACC.5,GO		;check the condition for AM or PM
	MOV A,#8AH
	ACALL COMNWRT
	ACALL DELAY
	MOV A,#'A'
	ACALL DATAWRT
	ACALL DELAY
	MOV A,#'M'
	ACALL DATAWRT
	ACALL DELAY
	SJMP GO1
GO:	MOV A,#8AH
	ACALL COMNWRT
	ACALL DELAY
	MOV A,#'P'
	ACALL DATAWRT
	ACALL DELAY
	MOV A,#'M'
	ACALL DATAWRT
	ACALL DELAY

GO1:	
	JNB RI,SS1
	CLR RI

       AJMP  SS

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;WRITE  OPERATION
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 
  WRITE:
  	CLR  SCLK		;CLEAR SCLK LINE 
        NOP
        NOP
        SETB CE        		; SET CE  HIGH FOR WRITE OPERATION
        NOP
        MOV  A,R1		;LOAD THE ADDRESS
        MOV  R2,#8		;COUNT =8
  WRITE_1: RRC  A          	; 
        MOV  IO,C		; SEND LSB FIRST AND THEN CONTINUE
        NOP
        NOP
        SETB SCLK		
        NOP
        NOP
        CLR  SCLK
        DJNZ R2,WRITE_1
        NOP
        NOP
  ;*************
        MOV  A,R0		;LOAD THE DATA
        MOV  R2,#8		;SET  COUNT =8
  WRITE_2: RRC  A          ; 
        MOV  IO,C
        NOP
        NOP
        SETB SCLK
        NOP
        NOP
        CLR  SCLK
        DJNZ R2,WRITE_2
        NOP
        NOP
        CLR  CE
        NOP
        NOP

        RET
;**********************************************/
;READ OPERAION
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  READ:
  	SETB  CE		;SET CE
        MOV  A,R1		;LOAD ADDRESS FIRST
        MOV  R2,#8
  READ_1: RRC  A
        MOV  IO,C		;MOVE THE ADDRESS THROUGH IO PIN
        NOP
        NOP
        SETB SCLK		;SET SCLK 
        NOP
        NOP
        CLR  SCLK		;CLEAR SCLK FOR WRITE OPERATION
        DJNZ R2,READ_1
        NOP
        NOP
        SETB IO
        CLR  A
        CLR  C
        MOV  R2,#8
  READ_2: MOV  C,IO
        RRC  A
        NOP
        NOP
        SETB SCLK
        NOP
        NOP
        CLR SCLK
        NOP
        NOP
        DJNZ R2,READ_2
        MOV  R0,A
;        ANL  A, #7FH
        CLR  CE
	
        RET
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;LCD INITIALIZATION
;...............................................
LCD_INIT:
	MOV A,#38H
	ACALL COMNWRT
	ACALL DELAY

	MOV A,#0CH
	ACALL  COMNWRT
	ACALL DELAY

	MOV A,#01H
	ACALL  COMNWRT
	ACALL DELAY

	MOV A,#06H
	ACALL  COMNWRT
	ACALL DELAY

RET
;;;;;;;;;;;;;;;;;;;;;;;;;;;
COMNWRT:
	MOV DPTR,#COM_ADR
	MOVX @DPTR,A
	NOP
	NOP
       RET
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
DATAWRT:
	MOV DPTR,#DAT_ADR
	MOVX @DPTR,A
	NOP
	NOP	
       RET
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
ASCIICONV:
	PUSH ACC
;	MOV A,R0
	SWAP A
	ANL A,#0FH
	ORL A,#30H
	ACALL DATAWRT
	ACALL DELAY
;	MOV A,R0
	POP ACC
	ANL A,#0FH
	ORL A,#30H
	ACALL DATAWRT
	ACALL DELAY
RET
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;*/
DELAY:
	MOV R3,#200
BACK:	MOV R4,#255
	DJNZ R4,$
	DJNZ R3,BACK

RET

        END

 

[pranam77]

Re: ds1302 with at89s8252

hiii pranam77,i am not able to attach the file. can u tell me

If you are trying to attach a hex file, or a source code, you cant. You have to ZIP it or compress it in .RAR and then Upload it. Cheers

 

[tapan.entc]

Re: ds1302 with at89s8252

hello pranam

please see the code and help me ....

i have only one day left for me to complete this code

i hope you will suggest me..

 

[pranam77]

Re: ds1302 with at89s8252

hello pranam. please see the code and help me ....i have only one day left for me to complete this code. i hope you will suggest me..

Frankly speaking, i am not the right person to debug source codes. You may get better replies from fellow memebers. Please be patient....Cheers