pic16f1455_oscillators
Differences
This shows you the differences between two versions of the page.
| Both sides previous revision Previous revision Next revision | Previous revision Next revision Both sides next revision | ||
|
pic16f1455_oscillators [2019/10/04 19:01] 60.240.96.191 [Oscillators on the PIC16F1455] |
pic16f1455_oscillators [2019/10/06 10:31] 60.240.96.191 [Using PLL to achieve 24MHz] |
||
|---|---|---|---|
| Line 63: | Line 63: | ||
| The on and off will be accurately changing every second, thanks to ensuring that ''_XTAL_FREQ'' matches the frequency chosen with the ''IRCF'' bits in the ''OSCCON'' register. | The on and off will be accurately changing every second, thanks to ensuring that ''_XTAL_FREQ'' matches the frequency chosen with the ''IRCF'' bits in the ''OSCCON'' register. | ||
| + | |||
| + | If you're observant, you may notice that the blinking interval is not exactly one second. I'll cover why shortly. | ||
| ===== Using PLL to achieve 24MHz ===== | ===== Using PLL to achieve 24MHz ===== | ||
| Line 101: | Line 103: | ||
| The datasheet does not list what the default for clock division is when resetting a PIC. However, the default in the configuration bits is shown as: ''CLKDIV6'' (using the MPLAB X IDE). Which means to divide the CPU clock by six. Or... make the CPU a sixth the normal speed. | The datasheet does not list what the default for clock division is when resetting a PIC. However, the default in the configuration bits is shown as: ''CLKDIV6'' (using the MPLAB X IDE). Which means to divide the CPU clock by six. Or... make the CPU a sixth the normal speed. | ||
| + | |||
| + | And this is why the interval was not quite correct when we were setting the 62.5kHz frequency in the previous section. It was because there was some CLKDIV dividing set. | ||
| ===== Low Frequency Internal Oscillator (LFINTOSC) ===== | ===== Low Frequency Internal Oscillator (LFINTOSC) ===== | ||
pic16f1455_oscillators.txt ยท Last modified: 2021/02/02 01:24 (external edit)
Page Tools
