Cancel manage topics Microchip licenses this software to you solely for use with Microchip * ; products. The software is owned by Microchip and/or its licensors, and is * ; protected under applicable copyright laws. All rights reserved. * ; * ; This software and any accompanying information is for suggestion only. * ; It shall not be deemed to modify Microchip?s standard warranty for its * ; products. It is your responsibility to ensure that this software meets * ; your requirements. * ; * ; SOFTWARE IS PROVIDED "AS IS". MICROCHIP AND ITS LICENSORS EXPRESSLY * ; DISCLAIM ANY WARRANTY OF ANY KIND, WHETHER EXPRESS OR IMPLIED, INCLUDING * ; BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS * ; FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. IN NO EVENT SHALL * ; MICROCHIP OR ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, * ; INDIRECT OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, HARM TO * ; YOUR EQUIPMENT, COST OF PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR * ; SERVICES, ANY CLAIMS BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY * ; DEFENSE THEREOF), ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER * ; SIMILAR COSTS. * ; * ; To the fullest extend allowed by law, Microchip and its licensors * ; liability shall not exceed the amount of fee, if any, that you have paid * ; directly to Microchip to use this software. * ; * ; MICROCHIP PROVIDES THIS SOFTWARE CONDITIONALLY UPON YOUR ACCEPTANCE OF * ; THESE TERMS. * ; * ;******************************************************************************* ; * ; Filename: LED JUMP * ; Date: * ; File Version: * ; Author: * ; Company: * ; Description: * ; * ;******************************************************************************* ; * ; Notes: In the MPLAB X Help, refer to the MPASM Assembler documentation * ; for information on assembly instructions. * ; * ;******************************************************************************* ; * ; Known Issues: This template is designed for relocatable code. As such, * ; build errors such as "Directive only allowed when generating an object * ; file" will result when the 'Build in Absolute Mode' checkbox is selected * ; in the project properties. Designing code in absolute mode is * ; antiquated - use relocatable mode. * ; * ;******************************************************************************* ; * ; Revision History: * ; * ;*******************************************************************************
;******************************************************************************* ; Processor Inclusion ; ; TODO Step #1 Open the task list under Window > Tasks. Include your ; device .inc file - e.g. #include <device_name>.inc. Available ; include files are in C:\Program Files\Microchip\MPLABX\mpasmx ; assuming the default installation path for MPLAB X. You may manually find ; the appropriate include file for your device here and include it, or ; simply copy the include generated by the configuration bits ; generator (see Step #2). ; ;*******************************************************************************
#include "p16F887.inc"
;******************************************************************************* ; ; TODO Step #2 - Configuration Word Setup ; ; The 'CONFIG' directive is used to embed the configuration word within the ; .asm file. MPLAB X requires users to embed their configuration words ; into source code. See the device datasheet for additional information ; on configuration word settings. Device configuration bits descriptions ; are in C:\Program Files\Microchip\MPLABX\mpasmx\P<device_name>.inc ; (may change depending on your MPLAB X installation directory). ; ; MPLAB X has a feature which generates configuration bits source code. Go to ; Window > PIC Memory Views > Configuration Bits. Configure each field as ; needed and select 'Generate Source Code to Output'. The resulting code which ; appears in the 'Output Window' > 'Config Bits Source' tab may be copied ; below. ; ;******************************************************************************* ; CONFIG1 ; __config 0x3FD4 __CONFIG _CONFIG1, _FOSC_INTRC_NOCLKOUT & _WDTE_OFF & _PWRTE_OFF & _MCLRE_OFF & _CP_OFF & _CPD_OFF & _BOREN_ON & _IESO_ON & _FCMEN_ON & _LVP_ON ; CONFIG2 ; __config 0x3FFF __CONFIG _CONFIG2, _BOR4V_BOR40V & _WRT_OFF
;******************************************************************************* ; ; TODO Step #3 - Variable Definitions ; ; Refer to datasheet for available data memory (RAM) organization assuming ; relocatible code organization (which is an option in project ; properties > mpasm (Global Options)). Absolute mode generally should ; be used sparingly. ; ; Example of using GPR Uninitialized Data ; ; GPR_VAR UDATA ; MYVAR1 RES 1 ; User variable linker places ; MYVAR2 RES 1 ; User variable linker places ; MYVAR3 RES 1 ; User variable linker places ; ; ; Example of using Access Uninitialized Data Section (when available) ; ; The variables for the context saving in the device datasheet may need ; ; memory reserved here. ; INT_VAR UDATA_ACS ; W_TEMP RES 1 ; w register for context saving (ACCESS) ; STATUS_TEMP RES 1 ; status used for context saving ; BSR_TEMP RES 1 ; bank select used for ISR context saving ; ;*******************************************************************************
; TODO PLACE VARIABLE DEFINITIONS GO HERE
;******************************************************************************* ; Reset Vector ;*******************************************************************************
RES_VECT CODE 0x0000 ; processor reset vector GOTO START ; go to beginning of program
;******************************************************************************* ; TODO Step #4 - Interrupt Service Routines ; ; There are a few different ways to structure interrupt routines in the 8 ; bit device families. On PIC18's the high priority and low priority ; interrupts are located at 0x0008 and 0x0018, respectively. On PIC16's and ; lower the interrupt is at 0x0004. Between device families there is subtle ; variation in the both the hardware supporting the ISR (for restoring ; interrupt context) as well as the software used to restore the context ; (without corrupting the STATUS bits). ; ; General formats are shown below in relocatible format. ; ;------------------------------PIC16's and below-------------------------------- ; ; ISR CODE 0x0004 ; interrupt vector location ; ; <Search the device datasheet for 'context' and copy interrupt ; context saving code here. Older devices need context saving code, ; but newer devices like the 16F#### don't need context saving code.> ; ; RETFIE ; ;----------------------------------PIC18's-------------------------------------- ; ; ISRHV CODE 0x0008 ; GOTO HIGH_ISR ; ISRLV CODE 0x0018 ; GOTO LOW_ISR ; ; ISRH CODE ; let linker place high ISR routine ; HIGH_ISR ; <Insert High Priority ISR Here - no SW context saving> ; RETFIE FAST ; ; ISRL CODE ; let linker place low ISR routine ; LOW_ISR ; <Search the device datasheet for 'context' and copy interrupt ; context saving code here> ; RETFIE ; ;*******************************************************************************
; TODO INSERT ISR HERE
;******************************************************************************* ; MAIN PROGRAM ;*******************************************************************************
MAIN_PROG CODE ; let linker place main program
START LED_ON BANKSEL PORTA ; CLRF PORTA ;Init PORTA BANKSEL ANSEL ; CLRF ANSEL ;digital I/O BCF STATUS,6 ;Bank 1 BANKSEL TRISA ; MOVLW 05h ;Set RA<3:2> as inputs MOVWF TRISA ;and set RA<5:4,1:0 BANKSEL PORTA BTFSC PORTA,0 MOVLW 0x80 MOVWF PORTA GOTO LED_ON GOTO START END