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Which is the default FRC oscillator for PIC24F?
The FRC oscillator with postscaler (FRCDIV) is the default (unprogrammed) selection. The secondary oscillator, or one of the internal oscillators, may be chosen by programming these bit locations. The Configuration bits allow users to choose among 11 different clock modes, listed in Table 38-1.
Can a 5V oscillator work with a PIC24 microcontroller?
The PIC24 series microcontrollers have 3.3V inputs so an oscillator with a 5V output will destroy your device. Best to get it right! The maximum DC characteristics for your microcontroller will be listed in the microcontrollers datasheet so it is easy enough to look up.
Is the PIC24 microcontroller compatible with USB 2.0?
One of the reasons we really like the PIC24FJ64GB004 microcontroller is that its internal oscillator is stable enough for USB2.0 – very rare in microcontroller. The PIC24 micro’s are incredibly versatile in their oscillator inputs. In general there are three categories of oscillators (or clocks) that are compatible with these devices.
What kind of oscillators can be used on a microcontoller?
In general there are three categories of oscillators (or clocks) that are compatible with these devices. They are: direct piezoelectric crystals (made of cut quartz), dedicated IC external clocks or the provided internal fast RC oscillator (FRC), so you can run the controller without an external input – we use this in most of our designs.
Why does an instruction take 8 clock cycles?
Some instructions take 8 clock cycles either because they skip over another instruction without executing it (e.g. BTFSS), cause the prefetched instruction to be discarded (e.g. 16F’s GOTO, 18F’s BRA) or because they contain an memory address that is split over two instruction words (e.g. the 18F’s CALL, LFSR, etc).
How many instructions per second on a 16F microchip?
So So the example 4 Mhz 16F device with no PLL can execute 4,000,000 / 4 = 1,000,000 single word instructions per second (e.g. 1 uSec per instruction) and the example 18F device would do 40,000,000 / 4 = 10,000,000 (e.g. 0.1 uSec = 100 nSec per instruction).