In my project I used PIC 16F877A to send logic 1 to the XBee transmitter and XBee receiver will receive that signal from the transmitter. The PIC 16F877A which is connect to the XBee receiver will give some output when receive that logic one. unforcentely the circuit not working the program for transmitter shown below

PROCESSOR P16F877A
INCLUDE "P16F877A.INC"
__CONFIG _XT_OSC & _WDT_OFF & _CP_OFF & _LVP_OFF & _PWRTE_ON
ORG 0X00
GOTO START
ORG 0X04
START:
BANKSEL TRISB
MOVLW 0X01
MOVWF TRISB
MOVLW B'00000100'
MOVWF TXSTA
MOVLW D'25'
MOVWF SPBRG
BSF TXSTA,5
BANKSEL PORTB
CLRF PORTB

LOOP:
BTFSs PORTB,0
CALL SEND1
GOTO LOOP
SEND1:
MOVLW 0X01
MOVWF TXREG
L2:
BTFSS PIR1,TXIF
GOTO L2
RETURN
END

the program for receiver

PROCESSOR 16F877A
INCLUDE <P16F877A.INC>
__CONFIG _XT_OSC & _WDT_OFF & _LVP_OFF & _PWRTE_ON & _CP_OFF
SAVE EQU H'20'
ORG 0X00
GOTO START
ORG 0X04
START:
BANKSEL TRISB
MOVLW 0X02
MOVWF TRISB
BANKSEL TRISD
MOVLW B'00000000'
MOVWF TRISD

MOVLW B'00000100'
MOVWF TXSTA
MOVLW D'25'
MOVWF SPBRG
BSF TXSTA,5
BANKSEL PORTB
CLRF PORTB

BANKSEL RCSTA
BSF RCSTA,SPEN
LOOP:
BTFSS PIR1,RCIF
GOTO LOOP
MOVF RCREG,W
MOVWF SAVE
BTFSS SAVE,1
GOTO NEXT
;/*********************************
BSF BORTD,0
BSF BORTD,1
BSF BORTD,3
;/*********************************
NEXT:
BTFSC SAVE,1
GOTO LOOP
;*********************************
BCF BORTD,0
BCF BORTD,1
BCF BORTD,3
;*********************************
END
can you help to solve my problem

 

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