PIC resets every now and then

[passion1]

AceTronics

My circuit looks exactly like the one on p.96 of the PBP manual that shows the default setup for connecting a LCD. (except for the fact that I am using a pic16f73 and a 20MHz crystal).

Thus default connections for LCD.

DEFINE OSC 20

DEFINE LCD_DREG PORTA
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTA
DEFINE LCD_RSBIT 4
DEFINE LCD_EREG PORTB
DEFINE LCD_EBIT 3

DEFINE LCD_BITS 4
DEFINE LCD_LINES 4
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50
DEFINE NO_CLRWDT 1 ' Don't insert CLRWDTs

TRISB=0 ' PORTB is output

ADCON1 =7 ' PORTA is digital


Thanking you in advance for any help or suggestions!

[Charles Linquis]

I would -

Add a 10uF tantalum cap very near the PIC between Vdd and GND. I would also lower the pull-up on MCLR to 4.7K.

[passion1]

Charles

The 10uF tantalum cap very near the PIC between Vdd and GND solved my problem!

Thanks so much!!