having problem on pic 16f690 and UIC00B

[rexwong0211]

Problem:
Found PICkit 2 - Operating System Version 2.32.0
PICkit 2 Unit ID = UIC00B V1.0
Target power not detected - Powering from PICkit 2 ( 5.00V)
PK2Error0024: PICkit 2 was unable to establish a valid Vdd on the target (Attempted 5.00V - Read 0.00V)
PICkit 2 Ready

Code:

CODE: SELECT_ALL_CODE

#include<pic.h>
#define _XTAL_FREQ 4000000

#define uchar unsigned char
__CONFIG(0xFF32);



void main(void)
{
   ANSEL = 0x00;      
   TRISC = 0x00;      
   
   while(1)
   {
      PORTC ^= 0x01;
      __delay_ms(500);         
   }
}

Method:
1. ICSP using UIC00B
2. MPLab 8.66
3. PICKit 2 v2.40
4. Universal Toolsuite v9.81
5. 5.21V pwr supply



THZ IN ADVANCE

[Idris]

Do you create your own circuit on stripboard? If yes maybe you need to connect 5V to UIC00B - VDD.

[rexwong0211]

Sry for taking so long to reply
i been asking my fren about this, i juz solved it.
the problem was the pins connection from uic00b cable, it was confusing n i mess it up
another problem i thk was the coding, i modified workable coding to test
i hav to test all components 1 by 1 to solve.

yes, i connect using breadboard.
Thr is 1 thg i still not sure, i didnt connect Vdd from uic00b but it still work.
so, wat the usage of the Vdd pin ???
From datasheet it is optional.
i giving 5V, 3 Amp to the circuit, it is current too high ????
#define _XTAL_FREQ 4000000 - this line is for internal crystal ?????

[yonghui]

the current is depending on the voltage, so if u keep your voltage to 5V then it is safe.
the #define _XTAL_FREQ 4000000
is your definition of a constant that you will use. you can remove it if u dont use it.
in hi-tech C compiler the delay routine will use this constant.
for crystal setting, you can set it at configuration bits.


regards,
yh

[rexwong0211]

Thz for the reply !!
- i using adapter constantly giving 5V, 3 amp; is this really ok w/o resistor ?
- i heard that 16f690 has internal crystal so does that mean external is not necessary (using 4Mhz) ?
- What is the usage of UIC00B - Vdd pins (circuit work even w/o it) ?

[robosang]

The Vdd of UIC00B is optional, if your circuit is not powered by itself, you can use the Vdd from UIC. Since you have the power, so have or don't have it will still work.

[rexwong0211]

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