Circuit diagram of MAX232 and 89C51

So now that you have it, do you understand it?

The connections of the capacitors are as shown in the Datasheet;

The logic-level transmit output from the 89C51 connects to the logic-level input of a transmitter in the MAX232;

The output of a transmitter in the MAX232 is RS232 - so that connects to the appropriate pin on your RS232 connector ('D'-type);

The input of a receiver in the MAX232 is RS232 - so that connects to the appropriate pin on your RS232 connector ('D'-type);

The logic-level output of a receiver in the MAX232 connects to the logic-level receive input of the 89C51.

It's really not rocket science!

So now that you have it, do you understand it?

The connections of the capacitors are as shown in the Datasheet;

The logic-level transmit output from the 89C51 connects to the logic-level input of a transmitter in the MAX232;

The output of a transmitter in the MAX232 is RS232 - so that connects to the appropriate pin on your RS232 connector ('D'-type);

The input of a receiver in the MAX232 is RS232 - so that connects to the appropriate pin on your RS232 connector ('D'-type);

The logic-level output of a receiver in the MAX232 connects to the logic-level receive input of the 89C51.

It's really not rocket science!

DUDE i am trying to watch the result on hyper terminal
can u send me any prog in assembley

1) I need the schema to a ...
2) Can you send me any prog ...
3) Can you come and solder together the unit?
4) Can you come and flash my processor?
5) Can you write my report, so I can turn it in?

Per:

you forgot DUDE:

trevlig helg

Erik

Ah, but I did look for earlier posts in the thread, but didn't find anyone named DUDE. However, it made me think about John Wayne - Duke.

Trevlig helg sjaelv!

(This forum doesn't support UTF-8 even if the encoding says UTF-8...)

Behold the future of engineering. Cheap, but clueless.

"can u send me any prog in assembley"

What - any program?

Sure - here is something in some assembler:

ProgStart:
  call _flushallmenus
  call _runindicoff

LoadRoutine:
  ld hl,RoutineStart
  ld de,_alt_on_exec
  ld bc,200

  ld de,$28
  ld a,(_alt_on_exec)
  ld hl,_alt_on_chksum + $28
  add a,(hl)
  add hl,de
  add a,(hl)
  add hl,de
  add a,(hl)
  add hl,de
  add a,(hl)
  add hl,de
  add a,(hl)
  ld (_alt_on_chksum),a

  set 3,(iy + $23)
  ret

RoutineStart:
.org _alt_on_exec

  in a,(5)
  push af

  ld a,$0d
  out (5),a

  call _clrScrn
  call _homeup

  ld hl,TextToDisplay
  call _puts
  call _newline

  pop af
  out (5),a

  ret