PIC18F4580如何倍频

只看该作者 · 2016-7-9 12:11

我选择内部8M晶振，PLLEN=1，然后调试串口，发现倍频之后还是8M
下面是程序，大家帮忙看看哪里有问题
// CONFIG1H
#pragma config OSC = IRCIO67    // Oscillator Selection bits
#pragma config FCMEN = OFF    // Fail-Safe Clock Monitor Enable bit (Fail-Safe Clock Monitor disabled)
#pragma config IESO = OFF    // Internal/External Oscillator Switchover bit (Oscillator Switchover mode disabled)

// CONFIG2L
#pragma config PWRT = OFF    // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = BOHW    // Brown-out Reset Enable bits (Brown-out Reset enabled in hardware only (SBOREN is disabled))
#pragma config BORV = 3       // Brown-out Reset Voltage bits (VBOR set to 2.1V)

// CONFIG2H
#pragma config WDT = OFF       // Watchdog Timer Enable bit (WDT disabled (control is placed on the SWDTEN bit))
#pragma config WDTPS = 32768 // Watchdog Timer Postscale Select bits (1:32768)

// CONFIG3H
#pragma config PBADEN = ON    // PORTB A/D Enable bit (PORTB<4:0> pins are configured as analog input channels on Reset)
#pragma config LPT1OSC = OFF // Low-Power Timer 1 Oscillator Enable bit (Timer1 configured for higher power operation)
#pragma config MCLRE = ON    // MCLR Pin Enable bit (MCLR pin enabled; RE3 input pin disabled)

// CONFIG4L
#pragma config STVREN = ON    // Stack Full/Underflow Reset Enable bit (Stack full/underflow will cause Reset)
#pragma config LVP = OFF       // Single-Supply ICSP Enable bit (Single-Supply ICSP disabled)
#pragma config BBSIZ = 1024    // Boot Block Size Select bit (1K words (2K bytes) boot block)
#pragma config XINST = OFF    // Extended Instruction Set Enable bit (Instruction set extension and Indexed Addressing mode disabled (Legacy mode))

// CONFIG5L
#pragma config CP0 = OFF       // Code Protection bit (Block 0 (000800-001FFFh) not code-protected)
#pragma config CP1 = OFF       // Code Protection bit (Block 1 (002000-003FFFh) not code-protected)
#pragma config CP2 = OFF       // Code Protection bit (Block 2 (004000-005FFFh) not code-protected)
#pragma config CP3 = OFF       // Code Protection bit (Block 3 (006000-007FFFh) not code-protected)

// CONFIG5H
#pragma config CPB = OFF       // Boot Block Code Protection bit (Boot block (000000-0007FFh) not code-protected)
#pragma config CPD = OFF       // Data EEPROM Code Protection bit (Data EEPROM not code-protected)

// CONFIG6L
#pragma config WRT0 = OFF    // Write Protection bit (Block 0 (000800-001FFFh) not write-protected)
#pragma config WRT1 = OFF    // Write Protection bit (Block 1 (002000-003FFFh) not write-protected)
#pragma config WRT2 = OFF    // Write Protection bit (Block 2 (004000-005FFFh) not write-protected)
#pragma config WRT3 = OFF    // Write Protection bit (Block 3 (006000-007FFFh) not write-protected)

// CONFIG6H
#pragma config WRTC = OFF    // Configuration Register Write Protection bit (Configuration registers (300000-3000FFh) not write-protected)
#pragma config WRTB = OFF    // Boot Block Write Protection bit (Boot block (000000-0007FFh) not write-protected)
#pragma config WRTD = OFF    // Data EEPROM Write Protection bit (Data EEPROM not write-protected)

// CONFIG7L
#pragma config EBTR0 = OFF    // Table Read Protection bit (Block 0 (000800-001FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR1 = OFF    // Table Read Protection bit (Block 1 (002000-003FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR2 = OFF    // Table Read Protection bit (Block 2 (004000-005FFFh) not protected from table reads executed in other blocks)
#pragma config EBTR3 = OFF    // Table Read Protection bit (Block 3 (006000-007FFFh) not protected from table reads executed in other blocks)

// CONFIG7H
#pragma config EBTRB = OFF    // Boot Block Table Read Protection bit (Boot block (000000-0007FFh) not protected from table reads executed in other blocks)

void Pic_Init()
{
GIE = 0;
//OSCILLATOR init
OSCCON  = 0x7F;// 8 MHz Internal Oscillator Frequency,Internal oscillator block OSCCON = 0b00001100 ; //
OSCTUNE = 0x40;//OSCILLATOR TUNING REGISTER PLLEN=1

//INTERRUPT init
//RCONbits.IPEN = 0 ;//关闭中断优先级
//EUSART init
//TXSTAbits.TX9 = 0 ;// Selects 8-bit transmission
//TXSTAbits.SYNC = 0;// Asynchronous mode
//TXSTAbits.BRGH = 1;//High speed
//TXSTAbits.TRMT = 1;
//TXSTAbits.TX9D = 0;
//TXSTAbits.SENDB = 0;
//TXSTAbits.TXEN =0;
TXSTA=0x26;

//RCSTAbits.SPEN = 1;
//RCSTAbits.RX9  = 0; //Selects 8-bit reception
//RCSTAbits.CREN = 1;//Continuous Receive Enable bit
//RCSTAbits.ADDEN = 0;
//RCSTAbits.FERR = 0;
//RCSTAbits.OERR = 0;
RCSTA=0x90;

BRG16 = 1;
SPBRG = 16;// SPBRG = 16;//19200波特率103  115200--16
//PIE1bits.TXIE = 1;

RCIF=0;
RCIE=1;
PEIE = 1;
GIE = 1;
}