第一次用PIC的片子，想用PIC12f675实现100KHz的PWM输出，看了下手册算了下应该是可以做1us定时的。但搞了半天最高只能输出15KHz。大家帮忙看看问题出在了哪里？- #include<pic12f675.h>
- // CONFIG
- #pragma config FOSC = INTRCIO // Oscillator Selection bits (INTOSC oscillator: I/O function on GP4/OSC2/CLKOUT pin, I/O function on GP5/OSC1/CLKIN)
- #pragma config WDTE = ON // Watchdog Timer Enable bit (WDT enabled)
- #pragma config PWRTE = OFF // Power-Up Timer Enable bit (PWRT disabled)
- #pragma config MCLRE = OFF // GP3/MCLR pin function select (GP3/MCLR pin function is digital I/O, MCLR internally tied to VDD)
- #pragma config BOREN = OFF // Brown-out Detect Enable bit (BOD disabled)
- #pragma config CP = OFF // Code Protection bit (Program Memory code protection is disabled)
- #pragma config CPD = OFF // Data Code Protection bit (Data memory code protection is disabled)
- #define nop() asm("NOP")
- #define u8 unsigned char
- #define u16 unsigned int
- #define PWM_A GPIO2
- #define LED GPIO1
- u8 n = 0;
- void init(void)
- {
- CMCON = 0x07;
- ANSEL = 0x00;
- WPU |= 0x20;
- TRISIO = 0x38;
-
- TMR0 = 0xFF;
- //OPTION_REG
- T0CS = 0;
- PSA = 1;
-
- //INTCON
- T0IF = 0;
- T0IE = 1;
- GIE = 1;
- }
- void __interrupt(low_priority) tmer0(void)
- {
- if(T0IF==1)
- {
- TMR0 = 0xFF;
- T0IF = 0;
- n++;
- if(n==1)
- PWM_A = 1;
- else
- {
- PWM_A = 0;
- n = 0;
- }
- }
- }
- void main(void)
- {
- init();
- while(1);
- }
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