Microchip 几种编译器 在代码中 对CONFIG 位的配置.doc

;*;*CONFIG Setting for PIC16/18 *;*This text is mainly on the method for the setting of configuration bits with both assembler&C. *;*- MPASM for PIC16Fxxx -;*;*1.To set CONFIG with assembler *;*With the source code written in assembler the configuration bits can been set by micro _CONFIG *;*The micro _CONFIG is after with the include file. *;*;*;*Example 1, CONFIG set for 16F877A *;* list p=16f877A ; list directive to define processor #include ; processor specific variable definitions;*;*Configuration bits *;*The _CONFIG directive defines configuration data within the .ASM file. *;* The labels following the directive are defined in the P16F877A.INC file. *;*The PIC16F877A Data Sheet explains the functions of the configuration bits. *;*_CONFIG _CP_OFF & _WDT_OFF & _BODEN_OFF & _PWRTE_ON & _RC_OSC & _WRT_OFF & _LVP_ON & _CPD_OFF; variable definitions;your code;END ；end of program;*- MPASM for PIC18Fxxxx -;*;*Example 2, CONFIG set for 18F452. As the configuration bits is more complex than 16F877, *;*it maps to more bytes in program memory instead of one word. *;* LIST P=18F452 ;directive to define processor #include ;processor specific variable definitions;*;*Configuration bits *;*The _CONFIG directive defines configuration data within the .ASM file. *;* The labels following the directive are defined in the P18F452.INC file. *; *The PIC18FXX2 Data Sheet explains the functions of the configuration bits. *;* _CONFIG _CONFIG1H, _OSCS_OFF_1H & _HS_OSC_1H _CONFIG _CONFIG2L, _BOR_OFF_2L & _PWRT_OFF_2L _CONFIG _CONFIG2H, _WDT_OFF_2H _CONFIG _CONFIG3H, _CCP2MX_OFF_3H _CONFIG _CONFIG4L, _STVR_OFF_4L & _LVP_OFF_4L & _DEBUG_OFF_4L _CONFIG _CONFIG5L, _CP0_OFF_5L & _CP1_OFF_5L & _CP2_OFF_5L & _CP3_OFF_5L _CONFIG _CONFIG5H, _CPB_OFF_5H & _CPD_OFF_5H _CONFIG _CONFIG6L, _WRT0_OFF_6L & _WRT1_OFF_6L & _WRT2_OFF_6L & _WRT3_OFF_6L _CONFIG _CONFIG6H, _WRTC_OFF_6H & _WRTB_OFF_6H & _WRTD_OFF_6H _CONFIG _CONFIG7L, _EBTR0_OFF_7L & _EBTR1_OFF_7L & _EBTR2_OFF_7L & _EBTR3_OFF_7L _CONFIG _CONFIG7H, _EBTRB_OFF_7H;*;Variable definitions;your code; END; end of program;*- Hi-Tech PICC (16Fxxxx) -;* ;*2.To set CONFIG with C language *;*;*;*a. Here is a example for HI-TECH PICC *;*/*#include #include /*/*The declaration of _CONFIG() is in pic.h */*The _CONFIG(x) directive defines configuration data within is in pic168xa.h */*_CONFIG(XT&WDTDIS&PWRTEN&BORDIS&LVPDIS&DUNPROT&DEBUGDIS&UNPROTECT);void main(void)/your code/*/*/*In pic.h the definition of _CONFIG(x) is as follows: */*#define _CONFIG(x) asm(tpsect config,class=CONFIG,delta=2); * asm(tdw _mkstr(x) */* pic168xa.h defines all the configuation bit values */*#define CONFIG_ADDR 0x2007 - Hi-Tech PICC18 -*/*b.In HI-TECH C18 , use macro _CONFIG(n,x)/* #include /*/*The declaration of _CONFIG(n,x) is in pic18.h */*The _CONFIG(n,x) directive defines configuration data within is in pic18fxx2.h */* _CONFIG(1,RC) ; _CONFIG(2,PWRTDIS & WDTPS1 & WDTEN ) ; _CONFIG(4,STVRDIS) ; void main(void)/your code/*/*/*In pic18.h the definition of _CONFIG(n,x) is as follows * /*#define _CONFIG(n, x) asm(tpsect config,class=CONFIG); */* asm(global config_word _mkstr(n); */* asm(config_word _mkstr(n):); */* asm(torg (_mkstr(n)-1)*2); * /* asm(tdw _mkstr(x) */* pic18fxx2.h defines the configuration bit values, */*- MPLAB C18 -;*;*3.For MPLAB C18 V2.40 or higher, use #pragma config directive *;*for example * /* #include /*/*Configuration settings may be specified with multiple #pragma config directives. */*MPLAB C18 verifies that the configuration settings specified are valid for the processor*/*for which it is compiling * /*The labels following the directive pragma config are defined in the P18F452.h file. */* #pragma config OSC=HS #pra