Get a DS89C450 running...

[glenjoy]

Even harder to wire such packaging.

 

[Apoxioman]

Yes it is..
but I'm crazy ))
see this
**broken link removed**
**broken link removed**

 

[liquid]

This will Hopefuly solve all ds89c420 /30/40/50 serial baud rate problems. I made this program which calculates all possible baud rates and errors so you can select the best available.

 

[aetosa]

I' ve built the programmer for ds89c430 , found on maxim's site (appnote **broken link removed** )
. My pcb layout is at:
**broken link removed** . BUT DOES NOT work . Can somebody tell me where I can find a simle programmer? i tried to open the website: **broken link removed** but would'nt open.
GlenJoy do you can help me?

 

[glenjoy]

Here are the pictures of my DS89C420 programmer.

PS.

Mods,

If I violated any rule/s by posting these pictures, please PM so I can edit or delete my post.

Thank you.

Here are the pictures:

 

[thran]

Hello,

This schema work to DS89C450?

Thanks

 

[JaMe]

I've got a DS89C450 in TQFP package. It is able to enter bootloader and I flash my program in it. I just want to make a LED blink in Port 1. This is my program:

#include <ds89c4xx.h>

unsigned int x;

void delay(){
unsigned c;
for (c=0; c<65000; c++);
}

void main(){
while(1){
for (x=0; x<20000; x++){
P1=0x00 ;
delay();
P1=0xFF;
delay();
}
}
}

The problem is, the LED doesn't blink at all. At this time, EA=0 V, RST=0 V; PSEN=2.5 V. I thought it was because EA=0. I've already pulled up EA with 1k resistor, but it still doesn't work. Anyone know about this ?

 

[onuragon]

i think your delay time it short you must use to for(...1000..){for(..1000...) }bla bla like this... because ds89cxxx so fast , vicious 1000000 = 1000 X 1000 .

 

[rajanjoshe]

Dear all,
ANyone please tell me the paging mechanism in 89c450.I do not login this forum frequently.So pls reply at rajanjoshe@rediffmail.com:?:

 

[rajanjoshe]

Dear all
I want DS89c450 to run on 1 clock cycle .I am using CRYSTAL of 22MHz.FOllowing is the code which i use in the start of main().I follow following routine given in datasheet.

1) Ensure that the current clock mode is set to divide-by-1 (CD1:0 = 10b) and that RGMD (EXIF.2) = 0.
2) Clear the CTM bit.
3) Put the 4X/2X bit in the desired state.
4) Set the CTM bit.
5) Poll for the CKRY (EXIF.3) bit to be set (= 1). This takes ~65536 external clock cycles.
6) Set CD1:0 = 00b. The frequency multiplier is engaged on the memory cycle following the writing of these bits.

Without inserting this routine my serial and timer are working but when i insert code it does not work Folling is the hardware initilisation routine where i insert code for 1 clock cycle-

void interrupt_set()
{
// Routine to set frequency 1 clock cycle
EXIF = 0x00;
PMR &= 0xEF;
PMR |= 0x08;
PMR |= 0x10;
while(!(EXIF&0x08));
PMR = 0x1D;
EXIF = 0x00;
//routine ends here
/* these is intialization of timers */
TMOD = 0x21; // 21`serial interrupt & timer 0
SCON0 = 0x50;
TH1 = -6;

TH0 = 0xf3;
TL0 = 0xcc;

EWDI = 0; //disable watchdog timer
mory and on chip sram
IP1 = 0x40; /*IP1 and IP0 is configured for serial priorty 3 and timer0 priorty 2 */
IP0 = 0x02;
/* intialization of interrupt */
EA = 1; // globle interrupt enable
ET0 = 1; // timer 0 interrupt
ES0 = 1; // enable the serial interrupt
/* intialization of priority */
PS = 1; // serial communication highest proirty
TR1 = 1;
TR0 = 1;

}


when I insert routine my serial does not work any idea?

 

[dookei]

it works through USB.[/img]

 

[alex_00787]

Hello,
Anyone please tell me how to program and run the DS89C450 without the use of a 74HC125. Because I only got the MAX233 chips and DS89C450.

 

[josiphal]

You can use mechanical switch on the place of HC125, so every time when you wont to switch program/run mode, do it manual.

 

[alex_00787]

Thank you Josiphal.
Finally i found this schematic from book, but it doesnt work at all.
Can anyone please tell me what the problem on this circuit?

 

[henary]

I am also finding anser of above quetion(?).....
I have diagram in book..

 

[ximon]

Hi, what is the most basic schematic for running code?? i am able to run the bootloader and load code onto the chip but i cannot get the code to run, not even a simple blinking led!!


Cheers,
Si


(The code i'm trying to get working, using 22.1184Mhz Crystal)

#include <DS89C4xx.h>
   
sbit led = P2^0;

void delay(void)
{
      unsigned int i, j;

      for(i=0; i<1000; i++)
      {
            for(j=0; j<1000; j++);
      }
}
   
void main(void)
{
      while(1)
      {
            led=0;  
            delay();  
            led=1;  
            delay();
      }
}

 

[lovedata]

Thx a lot!

 

[vishant]

can u say resistor's valur of reset.

 

[akashdk]

**broken link removed**download this DS89C450 programmer circuit..it'll answer every questions