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A device or circuit that generates an AC signal at a certain frequency.

4
votes
3answers
I've come across many equations in microchip datasheets that are based on this value and am looking for a central place to lookup definitions. F_OSC = oscillator frequency T_CY = 1 / F_CY = time to execute one assembly instruction? …
asked Mar 19 '14 by tarabyte
2
votes
1answer
, GSS_OFF // disable code protection, GCP_OFF // disable write protection, GWRP_OFF _FGS(GSS_OFF & GCP_OFF & GWRP_OFF) // OSCillator SELection … : // Primary oscillator (XT, HS, EC) w/ PLL FNOSC_PRIPLL // enable two-speed oscillator startup IESO_ON _FOSCSEL(FNOSC_PRIPLL & IESO_ON) // OSCillator configuration: // enable …
asked Feb 5 '13 by tarabyte
5
votes
2answers
I'm trying to configure Timer1 of a pic24h to 1ms per timer tick but don't seem to be able to get the math to match my results. I have a 20MHz external oscillator (with a 1M resistor in parallel for … stability) and think I have it enabled with the following configuration bits set in code: #pragma config FNOSC = PRIPLL // Oscillator Mode (Primary Oscillator (XT, HS, EC) w/ PLL) #pragma …
asked Nov 4 '13 by tarabyte
1
vote
1answer
I'd like to produce PWM outputs at f_PWM ~= 100kHz and I'd like to connect the ADC to sample at least once during each high-time interval of the PWM output. Everything in my configuration of these pe …
asked Nov 9 '13 by tarabyte
1
vote
1answer
I'm using an external 20MHz (categorized as high-speed or HS range) resonator and using PLL, but I'm not able to clock the device up anywhere near the max cpu speed advertised. How are you ever suppo …
asked Nov 23 '13 by tarabyte
1
vote
Two things to recognize: the timer is an upcounter that interrupts on overflows at which point you should reload the start of the upcounter. the frequency is the output of the PLL if you have one co …
answered Nov 27 '13 by tarabyte