如題我是用CCP模式來讀取一個頻率大概會是在1KHz內
不知那位大大能指點迷津
以下是我所寫的程式(假設沒錯)
總是覺的怪怪的每次讀到的值都不是很接近
我是讀CCPR2L跟CCPR2H內的值出來運算
程式如果有錯那請幫我指出
謝謝


list p=18f452,r=dec
#include p18f452.inc
W_Temp equ 0x22
STATUS_Temp equ 0x23
BSR_Temp equ 0x24

org 0x00
nop
goto Main_Program
org 0x08
bra INT_SER
org 0x18
bra INT_SER

org 0x30
Main_Program:
clrf Time_Flag
call Initial
call Time_INI
Left_Loop:
btfss Time_Flag,0,0
goto Left_Loop

Initial:
bsf TRISC,1,0

movlw b'10111100' movwf T3CON
bsf PIE2,CCP2IE
bsf IPR2,CCP2IP
bsf RCON,IPEN,0
bsf INTCON,PEIE,0
bsf INTCON,GIE,0
bsf T3CON,TMR3ON
movlw b'00000101'
movwf CCP2CON,0
return
Time_INI:
movlw 0xfc
movwf TMR3H,0
movlw 0x18
movwf TMR3L,0
return
INT_SER:
movwf W_Temp,0 movff STATUS,STATUS_Temp
movff BSR,BSR_Temp btfss PIR2,CCP2IF
btfss PIR1,TMR1IF,0
goto INT_SER_End
bcf PIR1,TMR1IF,0
incf Time_Counter,F,0
movlw 0x64
cpfseq Time_Counter,0
goto INT_SER_End
clrf Time_Counter,0
bsf Time_Flag,0,0


INT_SER_End:
bcf PIR2,CCP2IF
bcf PIR2,TMR3IF,0
clrf CCPR2L
clrf CCPR2H
call Time_INI
movff STATUS_Temp,STATUS
movff BSR_Temp,BSR
movf W_Temp,W,0 retfie
end