| ??? 02/03/09 16:13 Read: times |
#162006 - You need a faster MCU Responding to: ???'s previous message |
If you use a Maxim/Dallas MCU, i.e. DS89C430, at 25 MHz, for example, or any other "one-clocker" capable of that clock rate, then you can write (in ASM),
setb P0.0 clr P0.0 That will produce a 40 ns pulse on P0.0 if you provide a pullup resistor on P0.0. If you use one of the SiLabs 100 MIPs MCU's you can ostensibly produce even shorter pulses. There's no way to predict what will happen if you attempt to do this in 'C' or in Pascal, or any other HLL without extensive detail about the behavior of whatever compiler you use. RE |
| Topic | Author | Date |
| what is the signal freuency on all ports of at89c52/51 | 01/01/70 00:00 | |
| minimum pule is 1086 nanoseconds. | 01/01/70 00:00 | |
| Buzz! | 01/01/70 00:00 | |
| 40ns is a very short time | 01/01/70 00:00 | |
| You need a faster MCU | 01/01/70 00:00 | |
| the fastest '51 | 01/01/70 00:00 | |
| 80ns ? | 01/01/70 00:00 | |
| Sorry about that ... | 01/01/70 00:00 | |
| Still not known if single pulse or pulse train | 01/01/70 00:00 | |
| Where there's a will ... | 01/01/70 00:00 | |
| Timer or PCA | 01/01/70 00:00 | |
| repeat earlier question with clarity | 01/01/70 00:00 | |
| Timing can't be discussed when C is involved | 01/01/70 00:00 | |
| Think about it | 01/01/70 00:00 | |
| Supplementary question... | 01/01/70 00:00 | |
At first blush . . . | 01/01/70 00:00 |