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thanks everybody!
now. it's well - done! i think i've got a big mistake about LATx and PORTx ! Very Happy

Change it so you're writing to LATB instead of PORTB.
You mean I should use LATBx instead of RBx ?

I program on dsPIC30F4011 and my code as follow:

#include <30F4011.h>
#fuses XT_PLL4,NOWDT
#word TRISB = 0x02C6
#word PORTB = 0x02C8
#word LATB = 0x02CA

#bit TRISB8 ...

Thanks Ttelmah & PCM ! I've solved my problem!
First, I code as follow:

float64 measured_speed;
unsigned int16 temp;
measured_speed = (POSCNT - 32000)*1.875; /*POSCNT is an 16 bit r ...

I'd like to do some calculation. Because I'd like to get more precise result so in the calculation transition, I use float variables but in the final result I want to change into sign int16 variables ...

Thanks PCM Programmer ! I'll try it! Very Happy

I’ve read functions for string process in CCS user manual and I’ve got some questions as follow:
●cresult = strcmp(s1,s2)
As said in CCS user manual, cresult’s value may be -1 or 0 or 1 =& ...

I'd say, either the watchdog is getting enabled, and the chip is therefore restarting, or you have a glitch on the power supply, and the chip is doing a brownout restart. Either would explain what you ...

i think this problem is not easy to explain ! i've tried to use supported function by CCS and realize this interesting thing.
Compare two kind of coding following:
*1st case:

#include <3 ...

I'd like to send only one character into Hyperterminal at each time writing into U2TXREG. But when I used the following code, it gave me 8 similar characters. I can't explain why this happened like t ...

I've tried lcd.h &.c with PIC16F887 and dsPIC30F4011.Then they work well with only PIC16F887 .
Here the code for PIC16F887:

#include <16F887.h>
#device PASS_STRINGS = IN_RAM
#fuses XT, ...

it's well-done now, PCM programmer ! thank you very much ! Very Happy

I'd like to create a function to output a string into LCD, but there's a problem here.
lcd.h code:

#define LCD_module
#ifdef LCD_module
/********************************************/
#define ...

when i don't use this instruction "#fuses XT,NOWDT" and try to config directly through registers as the following function:
void Oscillator_Config()
{
/*Oscillator Sw ...

thank for your help a lot PCM programmer ! Very Happy