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AT90S8515 UART
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ENG\ AHMED
Thu May 08 2008, 10:53PM
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HI ALL,
I work with MCU 1 st time and i have a problem in programming UART transmision
That my programe is to send 0xff and ON indication LED then OFF the LED for 1 sec
but i found that the LED ON forever ,pls check my programme.
i use at90s8515 with 8mhz crystal
and that my programme.........

CODE:
LDI R18,0X80   ;STACK POINTER
OUT $3D,R18

SBI $11,4      ;O/P LED INDECATION

LDI R16,51     ;9600 BOUD RATE @8MHZ
OUT $09,R16

NEXT:
SBI $12,4                       ;LED ON
LDI R31,HIGH(2*ASD)
LDI R30,LOW(2*ASD)
RCALL STRANSMIT
RCALL DELAY1
CBI $12,4                       ;LED OFF
RCALL DELAY1
RJMP NEXT

DELAY1:                           ;ONE SEC DELAY
ldi r20, 20
ldi r21, 255
ldi r22, 255
DELAY:
dec r22
brne DELAY
dec r21
brne DELAY
dec r20
brne DELAY
ret

STRANSMIT:
SBI $0A,3                         ;TXEN  UCR(3)=1
AGAIN1:
LPM R20,Z
CPI R20,0                        ;COMBAR WITH LAST ZERO
BREQ QUIT
OUT $0C,R20                      ;DATA IN UDR
W:
SBIS $0B,5    ; ?
RJMP W
ADIW R31:R30,1
RJMP AGAIN1
QUIT:
CBI $0A,3
RET


ASD: .DB 0XFF
     .DB 0
 




[ Edited Fri May 09 2008, 02:50PM ]
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Ajay
Fri May 09 2008, 03:29PM
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I think you cannot use this instruction
LPM R20,Z

coz you are using 8515 so only LPM is allowed without operands.


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ENG\ AHMED
Fri May 09 2008, 10:39PM
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great thx ........... AJAY
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