how to display a 4-digit numeric data on 7-seg displays with variable data at receiver

[Mehtab Ali]

i have made the following  code.this code receives the data byte serially in ascii and then displays it on seven segment display. check it there might be some errors as i was in a hurry.also if you want that the digits remain displayed if transistor is off then use a latch to store the data.

 

                             org 0

 

                              mov tmod,#20h

                              mov th1,#-6

                              mov scon,#50h

                              setb tr1

 

there:                        mov r3,#04h

now:                          jnb r1,now

                                 mov dptr,#900h

 

                                 mov a,sbuf

                             anl a,#07h

                            movc a,@a+dptr

                             mov p0,a

                                 acall disp

 

back:                         djnz now

                              sjmp there

 

disp:                        cjne r3,#04h,next

                             mov p2,#01h

                                 ljmp back

 

next:                         cjne r3,#03h,next1

                                 mov p2,#02h

                                ljmp back

 

next1:                      cjne r3,#02h,next2

                                 mov p2,#04h

                                ljmp back

 

next2:                       cjne r3,#01h,back

                             mov p2,#08h

                              ret

 

org 900h

[write the seven segment codes here one by one starting with 0-9]

 

[Snehal]

while simulating in Keil its a prob with sbuf that u dont any value ovr thr…so only ‘0’ is displayed at evry disp with huge flikering….n i guess..for communication it has to be worked out on hardware itself …i guess…

[Mehtab Ali]

yes check hardware connections also make some modifications in program if necessary.also check that the seven segments codes you have written is correct.

[Author]

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