Rangkaian Frekuensi Counter Digital

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Judul : Rangkaian Frekuensi Counter Digital

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    Rangkaian Frekuensi Counter Digital

    With a microcontroller system AT89c2051 and an LCD display we can create a digital frequency counter which can measure frequencies up to 250KHz. LCD is used LM16200.

    LCD LM16200LM16200 LDC Pic
    Table LM16200.Pin LCD LM16200

    Scheme of frequency counter digital using AT89c2051 are as follows:
    Frekuensi Counter DigitalSkema Rangkaian Frekuensi Counter Digutal

    AT89c2051 to program, we use the Bascom 8051, the following programs Frequency caunter Digital Using AT89c2051:


    '--------------------------------------------------------
    ' file: efy20fm24.BAS 25-12-05
    ' Frequency Meter Program using AT89c2051 micro controller
    ' written using bascom-51 from www.mcselec.com holland
    ' an embedded visual basic compiler for 8051 micro
    ' controllers
    ' by K.S.Sankar Web: www.mostek.biz
    '------------------------------------------------------
    ' Connect the timer0 input P3.4 to a frequency generator
    ' with 24 mhz xtal accuracy ok upto 250khz
    ' define crystal speed and include file
    $regfile = "89c2051.dat"
    $crystal = 24000000
    ' define variables used
    Dim A As Byte
    Dim C As Long , D As Long
    Dim Count As Word
    Dim T0ic As Long
    Dim Delayword As Word

    ' Initialize variables
    Count = 0
    T0ic = 0
    D = 0
    ' initialize ports
    P1 = 0
    P3 = 255
    ' configure lcd display
    Config Lcd = 16 * 2
    Config Lcdpin = Pin , Db4 = P1.4 , Db5 = P1.5 , Db6 = P1.6 , Db7 = P1.7 , E = P1.3 , Rs = P1.2
    Cls
    'clear the LCD display
    Lcd " EFY Freq Meter "
    ' define timer0
    Config Timer0 = Counter , Gate = Internal , Mode = 1
    'Timer0 = counter : timer0 operates as a counter
    'Gate = Internal : no external gate control
    'Mode = 1 : 16-bit counter
    ' set t0 internal interrupt
    On Timer0 Timer_0_overflow_int
    ' interrupt will be generated on every 65536 count
    Priority Set Timer0
    Enable Interrupts
    Enable Timer0

    Counter0 = 0
    'clear counter
    Start Counter0
    'enable the counter to count
    Do
    'set up a 1 sec accurate DO NOTHING loop
    Enable Interrupts
    'wait 1 as per BASCOM-51 is not accurate
    For Delayword = 1 To 45440
    Next Delayword
    Disable Interrupts
    C = Counter0
    'get counter value
    D = T0ic * 65536
    Lowerline
    C = C + D
    T0ic = 0
    Lcd " "
    Lowerline
    ' show the frequency
    Lcd "f=" ; C ; " Hz"
    Waitms 255
    Waitms 255
    C = 0
    Counter0 = 0
    Start Counter0
    're-start it because it was stopped by accessing the COUNTER
    Loop

    ' timer0 int subroutine
    Timer_0_overflow_int:
    Rem timer0 overflow ( 65535 ) interrupt comes here
    ' increment the variable
    Incr T0ic
    Return
    End
    ' end of program
    ' uses 1106 bytes of program memory


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