| ??? 09/29/08 18:51 Read: times |
#158655 - Comments Responding to: ???'s previous message |
David Prentice said:
AFIK, all ARMs run on 3.3V and will not tolerate 5V on every pin. From the documentation, the GPIO ports are 5V tolerant but if you select an alternate function you cannot assume the tolerance. That sounds like waaaaaay too much of a sweeping generalisation! ARM is an architecture, not a chip - so it's up to the individual implementation what supply voltage it runs on, what GPIOs it may or may not have, whether they may or may not have alternate functions, whether any, some, or all may or may not be 5V tolerant, etc, etc... In fact, there is no such thing as just "ARM" - there's ARM9, ARM7, various varieties of Cortex, etc, etc... They will probably use more power than most modern 8-bit controllers, especially if you compare at 3.3V.
They will probably process far faster than any 8 bit controller If they can process faster, you then have the choice to reduce the clock rate - and hence reduce power consumption... I think that ARM chips are only available in surface-mount I think that is also true of modern 8051 derivatives? |
| Topic | Author | Date |
| When to ARM ? | 01/01/70 00:00 | |
| to ARM or not to ARM | 01/01/70 00:00 | |
| Comments | 01/01/70 00:00 | |
| Point taken | 01/01/70 00:00 | |
| Most often pin config doesn't matter | 01/01/70 00:00 | |
| Cortex-M3 | 01/01/70 00:00 | |
| ARMs | 01/01/70 00:00 | |
| 3V vs 5V | 01/01/70 00:00 | |
| Excellent | 01/01/70 00:00 | |
| NXP LPC2000 | 01/01/70 00:00 | |
people migrating from PICs. | 01/01/70 00:00 |