[Help] UIC00B in-circuit serial programming failed

[ursular]

Hi all,

I have a problem when trying the ICSP function of UIC00B with PIC16F877A, and I hope can get some hints and suggestions from you. When I connect my target board with UIC00B, I got the message box saying "PICKIt 2 VPP voltage level error. Check target & retry operation." It was mentioned in the troubleshooting section in the manual that no capacitor should be connected with MCLR pin of the PIC, but a 0.1uF capacitor was used in the figure on p.36.

As I do not have electronic background, I do not really understand the purpose of using the capacitor... and I cannot thus know whether I need the capacitor or not... In addition, do I need to connect the RB3/PGM pin to the ground (it was mentioned in one of the example PR7_DD.pdf)?

Many thanks if anyone can help!

[yonghui]

hi,

there are 4 pins necessary, Gnd, PGD, PGC, and MCLR needed to be connected.
Vcc is optional depending whether u have power supply to ur PIC.
MCLR will be fetched with a voltage up to 12v, so be careful that there are no other component connect to it unless u have diode to block it. PGM is not necessary for ICSP using UIC00B.

hope this info do help u. remember the GND must be connected together.


regards,
yh

[robosang]

Yup, if you put high capacitance component at MCLR/VPP pin, the program loading process will fail....

[zhenning]

Make sure your ICSP pin is connected correctly