| ??? 01/07/06 20:50 Modified: 01/07/06 20:54 Read: times |
#106801 - mode 3 again Responding to: ???'s previous message |
Kai said:
I'm not familiar with this chip, but maybe 74HC74 can even be omitted, if mode 3 is used (square wave generator instead of rate generator). If Mode 3 is used, 74hC74 can indeed be omitted. But for certain frequencies the square wave becomes slightly unsymmetrical, output high for (n+1)/2 counts and output low for (n-1)/2 counts, where 'n' is the individual divisor needed to derive this certain frequency from master clock of 2MHz (20kHz). This is the case, if 'n' is odd. Kai |
| Topic | Author | Date |
| frequency generation | 01/01/70 00:00 | |
| Use an NCO | 01/01/70 00:00 | |
| Microcontroller emulates NCOs | 01/01/70 00:00 | |
| Nice but... | 01/01/70 00:00 | |
| we can think of something | 01/01/70 00:00 | |
| nothing special | 01/01/70 00:00 | |
| how about a PLL (Phase Locked Loop) | 01/01/70 00:00 | |
| PLL | 01/01/70 00:00 | |
| 0 ? | 01/01/70 00:00 | |
| Part no? | 01/01/70 00:00 | |
| Clock speed | 01/01/70 00:00 | |
| 0 Hz Frequency | 01/01/70 00:00 | |
| Differenece between... | 01/01/70 00:00 | |
| If Max is 1 kHz, ... | 01/01/70 00:00 | |
| more details | 01/01/70 00:00 | |
| Difficult ! | 01/01/70 00:00 | |
| 8253? | 01/01/70 00:00 | |
| Mode 3 | 01/01/70 00:00 | |
| mode 3 again | 01/01/70 00:00 | |
| Example | 01/01/70 00:00 | |
| 1MHz / 1001 | 01/01/70 00:00 | |
| Concretely... | 01/01/70 00:00 | |
| Overview of functions | 01/01/70 00:00 | |
| What do you think? | 01/01/70 00:00 | |
| why not '52? | 01/01/70 00:00 | |
| is it possible? | 01/01/70 00:00 | |
| its an option | 01/01/70 00:00 | |
please i need to square wave osscillator | 01/01/70 00:00 |