Mede_Oscilator

/* Registers associados com o Timer 1 e envolvidos como code
 *
 * TCCR1A  Timer/Counter1 Control Register A   COM1A1 COM1A0 COM1B1 COM1B0 – – WGM11 WGM10 -->> 0x40
 *
 *      Compare Output Mode, non-PWM
 *      COM1A1/COM1B1 COM1A0/COM1B0   0 1 Toggle OC1A/OC1B on Compare Match.
 *
 *      Mode | WGM13 | WGM12 | WGM11 | WGM10 | Timer/Counter   |  TOP  | Update of | TOV1 Flag
 *           |       | CTC1) |(PWM11)|(PWM10)|Mode of Operation|       | OCR1x at  |  Set on
 *       4   |   0   |   1   |   0   |   0   |       CTC       | OCR1A | Immediate |   MAX
 *
 *          MAX = The counter reaches its MAXimum when it becomes 0xFFFF (decimal 65535).
 *
 * TCCR1B – Timer/Counter1 Control Register B   ICNC1 ICES1 – WGM13 WGM12 CS12 CS11 CS10   -->>  0x09
 *
 *        Mode | WGM13 | WGM12(CTC1)
 *          4   |   0   |      1
 *
 *        CS12 | CS11 | CS10 | Description
 *         0   |  0   |   0  | No clock source (Timer/Counter stopped).
 *         0   |  0   |   1  | clkI/O/1 (No prescaling)             8 mHz
 *         0   |  1   |   0  | clkI/O/8 (From prescaler)            1 mHz
 *         0   |  1   |   1  | clkI/O/64 (From prescaler)         125 kHz
 *         1   |  0   |   0  | clkI/O/256 (From prescaler)      31250 Hz
 *         1   |  0   |   1  | clkI/O/1024 (From prescaler)    7812,5 Hz
 *         1   |  1   |   0  | External clock source on T1 pin. Clock on falling edge.
 *         1   |  1   |   1  | External clock source on T1 pin. Clock on rising edge.
 *
 *  DDRB  =  Direction port bits  0 INPUT  1 OUTPUT
 *
 *  OC1A/PCINT1 – Port B, Bit 1
 *  OC1A, Output Compare Match output: The PB1 pin can serve as an external output for the Timer/Counter1
 *  Compare Match A. The PB1 pin has to be configured as an output (DDB1 set (one)) to serve this function.
 *  OC1A  é o PIN PB1  OC1A (Timer/Counter1 Output Compare Match A Output)   PORT 9
 */

 //------- CODE ----------------
void setup()
{
  DDRB = 0x02;          // define port 9 como saida
  TCCR1A = 0x40;        // Ler texto acima
  TCCR1B = 0x0A;        // Ler texto acima      1 mHz
}
//---------------------------
void loop ()
{
;
}