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Recent content by wcgan

  1. W

    [Question] LED blinking + brightness (using PWM + Timer)

    Hi all, I have a project, below is the requirement: -> Control LED brightness + blinking rate(OnTime and OFFtime). I am able to control the LED brightness using PWM. My idea is using Timer to set the blinking. How can I compile the PWM and TIMER together? Microcontroller: Freescale...
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    Problem generating a 1us delay in 18F4550 program

    how to generate delay in 18f4620 I have changed my Crystal to 20MHz. C Compiler: MCC 18 below is my configuration settings: Address Value 300000 - 0x24 ============== 96MHz PLL Prescaler : Divide by 5 (20Mhz Input) CPU System Clock Postscaler : [OSC1/OSC2 Src: /1][96MHz PLL Src: /2]...
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    Problem generating a 1us delay in 18F4550 program

    delay_us Hi all, I having a problem to generate a 1us delay in my program. Details: IC - 18F4550 Crystal - 4MHz Compiler - C18 I am able to generate 1us by calling function "Delay1TCY()" 12 times. But I convert it to for..next to run 12 times, it will generate longer than 1us. Is there any...
  4. W

    [solved]PIC timer interrupt simple question

    mcc18 opentimer1 Hi shashavali_m, after OpenTimer1(...), T1CON value was 0x35 Hi umery2k75, I already set the global interrupt to enable. INTCON=0b10000000; INTCON.7 = GIE/GIEH: Global Interrupt Enable bit. thanks. Added after 4 hours 20 minutes: Hi all, I found another example and it...
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    [solved]PIC timer interrupt simple question

    pic timer interrupt Hi all, I have tried the code below to generate an interrupt after timer1 overflow. but it does not working. Can anyone help to correct my code? or give me a simple example of timer interrrupt? thanks. #include <timers.h> #include <p18cxxx.h> void timer1_isr(void)...
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    some basic PIC microcontroller question..need your help

    thanks.. i found out the reason. TMR2 output = (4 / FOSC) x N x (PR2 + 1)
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    some basic PIC microcontroller question..need your help

    [ SPI Clock Problem ] Hi , I would like to generate 500k SPI clock with external crystal 4Mhz. from datasheet, SPI clock have 4 modes(SSPCON) 0000 = SPI Master mode, clock = FOSC/4 0001 = SPI Master mode, clock = FOSC/16 0010 = SPI Master mode, clock = FOSC/64 0011 = SPI Master mode, clock =...
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    some basic PIC microcontroller question..need your help

    thanks. i understand the memory size already. but i still cant understand wat r the different between 14-bits op-code vs. 8-bits op-code... hope you can give me a sample on it.. thanks a lot.
  9. W

    some basic PIC microcontroller question..need your help

    because the PIC16F876 datasheed showing that 368 x 8 bytes,after the 8 following with 'bytes' not 'bits', so i confuse on the number of 8 is represent of 'bit' or 'byte'.
  10. W

    some basic PIC microcontroller question..need your help

    sorry, i am not understand yet. u mentions ram is counted in bytes. is that means PIC16F876A total RAM size r 2944 bytes? 368 x 8 bytes = 2944 bytes
  11. W

    some basic PIC microcontroller question..need your help

    Hi all, I am fresh to PIC controller, i hv some basic microcontroller question need you help.. Question 1:Memory Size: For 8051, datasheet written - 128 x 8-bit Internal RAM is that means 1 memory location can store 8-bits data. total hv 128 memory location, so the total memory RAM size is...
  12. W

    who know this symbol?

    yes, oxplorer... this is a white led. thanks
  13. W

    who know this symbol?

    LED not only 2 pins and no square shape on the symbol?
  14. W

    who know this symbol?

    Hi all, Anyone know this symbol is represent what component? Thanks.
  15. W

    8051 + AT commands using Nokia phone

    nokia 1600 sending sms by microcontroller circuit 89C51 datasheet - http://www.datasheetcatalog.com/datasheets_pdf/8/9/C/5/89C51.shtml 89S51 datasheet- **broken link removed**
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