t0se equ 4 ; TMR0 source edge select bit.
psa equ 3 ; Prescaler Assignment bit.
ps2 equ 2 ; PS2:PS0 = Prescaler rate select bits.
ps1 equ 1 ; For TMR0 = 1:2 to 1:256.
ps0 equ 0 ; WDT = 1:1 to 1:128.
; ----- For I/O ports A. (RA)
ra4 equ 4 ; RA4/T0CKI.
t0cki equ 4 ; Same as ’ra4’.
ra3 equ 3 ; RA3.
ra2 equ 2 ; RA2.
ra1 equ 1 ; RA1.
ra0 equ 0 ; RA0.
; ----- For I/O ports B. (RB)
rb7 equ 7 ; RB7.
rb6 equ 6 ; RB6.
rb5 equ 5 ; RB5.
rb4 equ 4 ; RB4.
rb3 equ 3 ; RB3.
rb2 equ 2 ; RB2.
rb1 equ 1 ; RB1.
rb0 equ 0 ; RB0.
int equ 0 ; Same as ’rb0’.
; ----- For EEPROM control register. (EECON1)
eeif equ 4 ; EEPROM write operation interrupt flag bit.
wrerr equ 3 ; EEPROM write error flag bit.
wren equ 2 ; EEPROM write enable bit.
wr equ 1 ; EEPROM write control bit.
rd equ 0 ; EEPROM read control bit.
; ----- For general
w equ 0 ; Destination selector. (Working register)
f equ 1 ; Destination selector. (Register file)
;*************************************************************************
;
; SOFtware for Frequency Counter model PIC-FC1.
; Version 1.00.
;
; Copyright (c) 1999 by 32 Technical Laboratory. (JG6DFK/QRP)
; All rights reserved.
;
;*************************************************************************
; I/O assignment:
; RA4 (PIN 3) Input. (I)
; RA3 (pin 2) LCD Data #3. (O)
; RA2 (pin 1) LCD Data #2. (O)
; RA1 (pin 18) LCD Data #1. (O)
; RA0 (pin 17) LCD Data #0. (O)
; RB7 (pin 13) LCD Load Enable. (O)
; RB6 (pin 12) LCD Register Select. (O)
; RB5 (pin 11) Display Mode. (I)
; RB4 (pin 10) External prescaler mode. (I)
; RB3 (pin 9) Internal prescaler mode #1. (I)
; RB2 (pin 8) Internal prescaler mode.#0. (I)
; RB1 (pin 7) Gate time #1. (I)
; RB0 (pin 6) Gate time #0. (I)
.include 16f84_32.h
.osc xt ; Clock = 10 MHz.
.wdt off
.pwrt on
.protect off
id 0100h ; = Version No.
;-------------------------------------------------------------------------
; Equations.
;-------------------------------------------------------------------------
; ----- I/O difinitions.
LCD_LE equ rb7 ; LCD load enable.
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本文关键字：单片机 PIC单片机，单片机-工控设备 - PIC单片机
