dear Jon,

i'm using a MAX232N chip in my circuit but i dont have the DS1812 chip as in your example circuit diagram.

so can i follow the standard Max232 wiring as this?





if i write a program code in assembly for the Atmel 89s8253

but i include this AT89s8252.inc in the code,is it working?


i use your test program 1 and Example Program 2 - polled transmit and polled receive
just add in the header part in asm file,then i use a simple compiler.exe to compile it into .hex file
i burn the program into the chip but it seem not working.

i think my circuit's wiring got problems,but not sure for my program part.

.NOLIST ; 
.INCLUDE "AT89s8252.inc" ; 
.LIST ; 

ORG 0
Loop:
MOV C,P3.0
MOV P3.1,C
SJMP Loop

 

thanks for guiding me!