感謝版主大人！

以下為設定範例:


如需更詳細的定義說明，請參考該元件的 H 檔之說明:
C:\Program Files\Microchip\MPLAB C30\support\PIC24H\h

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/* Register FOSCSEL (0xf80006) */

#define _FOSCSEL(x) __attribute__((section("__FOSCSEL.sec,code"))) int _FOSCSEL = (x);

/*
** Only one invocation of FOSCSEL should appear in a project,
** at the top of a C source file (outside of any function).
**
** The following constants can be used to set FOSCSEL.
** Multiple options may be combined, as shown:
**
** _FOSCSEL( OPT1_ON & OPT2_OFF & OPT3_PLL )
**
** Oscillator Source Selection:
** FNOSC_FRC Fast RC oscillator
** FNOSC_FRCPLL Fast RC oscillator w/ divide and PLL
** FNOSC_PRI Primary oscillator (XT, HS, EC)
** FNOSC_PRIPLL Primary oscillator (XT, HS, EC) w/ PLL
** FNOSC_SOSC Secondary oscillator
** FNOSC_LPRC Low power RC oscillator
** FNOSC_FRCDIV16 Fast RC oscillator w/ divide by 16
** FNOSC_LPRCDIVN Low power Fast RC oscillator w/divide by N
**
** Two-speed Oscillator Startup :
** IESO_OFF Disabled
** IESO_ON Enabled
**
*/

#define FNOSC_FRC 0xFFF8
#define FNOSC_FRCPLL 0xFFF9
#define FNOSC_PRI 0xFFFA
#define FNOSC_PRIPLL 0xFFFB
#define FNOSC_SOSC 0xFFFC
#define FNOSC_LPRC 0xFFFD
#define FNOSC_FRCDIV16 0xFFFE
#define FNOSC_LPRCDIVN 0xFFFF

#define IESO_OFF 0xFF7F
#define IESO_ON 0xFFFF
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大家好！

我想在 c code 中 設定 PIC24H 的 configuration bit
但找不到其語法的說明資料，不知有誰知道？