| ??? 09/29/08 18:42 Read: times |
#158653 - to ARM or not to ARM Responding to: ???'s previous message |
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.
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, but this all depends on the particular use. For instance if you do 32 bit math or want to control a 32 bit port in one go, there is no contest. If you are manipulating single bits and use mostly 8 bit variables you will see little difference. The Keil evaluation compiler can produce more usable programs than the Keil evaluation 8051 compiler. The ARM-gcc compiler is free and well supported. I think that ARM chips are only available in surface-mount, but are certainly cheap for their peripherals, price and performance. David. |
| 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 |