hello ,
I want to burn hex code from Laptop to p89v51rd2. but I don't have usb to rs232 serial cable
laptop -aspire746
os- window 7
serial port
microcontroller nxp89v51rd2
compiler - keil
programer software - flesh magic
com port 1
baud rate 9600
interface - none ISP
max RS232IC
usb to rs232 serial cable is not available in my place so I used two cable to burn hex code I have driver cd programmer circuit +Db9 male connector +db9female connector------cable-----db9 female+db9male--able --- usb port to laptop port
how to know that my controller and programmer circuit is working correctly
so I used multimeter I connected 9 v dc battery and I measured supply voltage for microcontroller I got 3.95 vdc and I saw 3.65 vdc for programmer circuit
so my controller and programmer circuit is correct ?
you mean datasheet .at this time I don't have good quality picture. I have image that you gave me in another post
I have made this connection on bread board .
I used multimeter I connected 9 v dc battery and I measured supply voltage for microcontroller I got 3.95 vdc and I saw 3.65 vdc for programmer circuit
look at this code and tell me its correct
look at this assembly code
Code:
org 00h
Setb P3.2 ; Led on
clr P3.2 ; Led off
delay:
mov R1, #20
mov R2, #0
delay1: djnz R2, delay1
djnz R1, delay1
ret
end
hex code
Code:
:0D000000D2B2C2B379147A00DAFED9FC2224
:00000001FF
I tried to burn hex code but I got message reset device in ISP mode now ?