| ??? 01/07/06 19:56 Read: times |
#106794 - 8253? Responding to: ???'s previous message |
Mahmood said:
I need to generate a square wave from 0 to 1kHz with 1Hz resolution. Any ideas how to do this? Why not using a 8253? Contains three independent 16bit counters to provide a divide by n. First gets a 2MHz clock and generates frequencies in the upper range (<=2kHz), second gets a 20kHz clock and generates frequencies in the lower range (>=2Hz). A 74HC74 at the two outputs divides by two and delivers symmetrical square wave. No jitter, no settling time, precision of frequency better than 0.05%. 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 |