;| Total timing formula: |
;| |
;| N = 25 000 * Fx = 60*[7*(36 + 3*T1) + 6 + 3*T2] + 12 + 3*T3 + Z |
;| |
;| where T1,T2,T3 are initial values of timing loops, |
;| Z are additional tunig NOPs, |
;| Fx Xtal frequency in MHz. |
;| |
;|------------------------------------------------------------------------|
;| Some ideas were taken from "Simple low-cost digital frequency meter |
;| using a PIC 16C54" (frqmeter.asm) |
;| written by James Hutchby, MadLab Ltd. 1996 |
;|------------------------------------------------------------------------|
;| |
;| This software is free for private usage. It was created for HAM radio |
;| community members. Commercial exploatation is allowed only with |
;| permission of authors. |
;| |
;|------------------------------------------------------------------------|
; include <p16c84.inc>
include <p16f84.inc>
;--------------------------------------------------------------------------
Index equ 0Ch ; dummy register
Count equ 0Dh ; inkremental register
Help equ 0Eh ; dummy register
LED0 equ 0Fh
LED1 equ 010h
LED2 equ 011h
LED3 equ 012h
LED4 equ 013h
LED5 equ 014h
LED6 equ 015h
LED7 equ 016h
TimerH equ 017h ; higher byte of SW counter
LowB equ 018h ; low byte of resuLTEd frequency
MidB equ 019h ; middle byte of resulted frequency
HigB equ 01Ah ; high byte of resulted frequency
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本文关键字：暂无联系方式PIC单片机，单片机-工控设备 - PIC单片机
