Reset problem

"I am Using TPS3836k33DBVT reset IC. at 200ms delay time. It doesnt reset at all."

Have you checked with an oscilloscope at the LPC2124's reset pin to verify that it is getting a good reset pulse?

Are you sure the polarity is correct?

Yes i checked, it is giving reset after 200mS delay as specified and the raising edge almost vertical.

and polarity also correct.

Still this looks like a hardware problem too me. We have several customers that are using an RESET circuit.

What is the status of the config pins at reset. The device has several config pins that influence the operation.

Reinhard

Thanks You are correct.

I left three following pins open during operation with the intention of all of them have internal pulup resistors

P0.14
P1.26
P1.20

But P0.14 dont have pulup and it allows bootloader to take control in some instant, i think if low state appears randomly.

Regards

I did following to get Square wave form at P0.21 of LPC2124

PWMPR =0;
PWMPCR = 0; //SINGLE EDGE
PWMMCR= 0X0002; // TC reset when match MR0

PWMMR0=100;
PWMMR5=50;
PWMLER=0X21; //MR0 &MR5 will be effective

PWMTCR= 0X02; // reset TC & RC
PWMTCR= 0x09; //counter & PWM enable

PWM module ON & p0.21 selected for PWM5 o/p


I cant see any wave form on P0.21
after down loading

Can any one locate the prob.

Hi

may be you have to configure the PINSELx before using PWM.

I'm offline to the specs but for sure without activating over PINSELx you have just GPIO at the PWM pins.
Only ADC is invoked by default.

Günter

Hi Günter
thanks
I did these settings.
But i found the problem now

I need this statement to enable PWM5
PWMPCR |=0x2000;//PWMENA5 enabled.

Now it works fine

Thanks.

Hi

Any one developing IrDA interface with LPC2124 or LPC313x;

I am using MCP2155(from mhip) and connect to UART1 of LPC2124.

Do any one have interfacing program for MCP2155.

Or did any have similor experience

regards
k.muraletharan